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A bag or pack, such as a backpack, having a pack portion that includes a back side made of flexible material, a carrying system directly or indirectly connected to the pack portion and including at least one carrying element, a frame connected to the pack portion, the frame including at least a rigi

A bag or pack, such as a backpack, having a pack portion that includes a back side made of flexible material, a carrying system directly or indirectly connected to the pack portion and including at least one carrying element, a frame connected to the pack portion, the frame including at least a rigid or semi-rigid sheet frame which is affixed to the back side of the pack portion by adhesive bonding.

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1. A backpack comprising: a pack portion made of flexible material and including a back side, an inner compartment to accommodate a load to be carried during use of the backpack, the inner compartment being demarcated at least in part by the back side;a carrying system directly or indirectly connect

1. A backpack comprising: a pack portion made of flexible material and including a back side, an inner compartment to accommodate a load to be carried during use of the backpack, the inner compartment being demarcated at least in part by the back side;a carrying system directly or indirectly connected to the pack portion and comprising at least one shoulder strap connected by an anchoring part of an upper end to an upper shoulder strap attachment portion of the back side of the pack portion;a frame connected to the pack portion, the frame extending along a region of the back side of the pack portion including at least the upper shoulder strap attachment portion and a lumbar portion of the back side of the pack portion;the frame comprising at least a rigid or semi-rigid sheet, the sheet being more rigid than the flexible material of the pack portion, and a sheet of elastically compressible foam;the frame being non-removably adhesively bonded to the back side of the pack portion by an adhesive bond, in the form of a thermo-activated glue or glue-containing compound, between the frame and the back side of the pack portion at the shoulder strap attachment portion of the back side of the pack portion;an adhesive bond between the anchoring part of the upper end of the shoulder strap and the shoulder strap attachment portion of the back side of the pack portion, in the form of a thermo-activated glue or glue-containing compound, thereby non-removably adhesively bonding the anchoring part of the upper end of the shoulder strap directly or indirectly to the shoulder strap attachment portion of the back side of the pack portion. 2. A backpack according to claim 1, wherein: the carrying system comprises a pair of shoulder straps, each shoulder strap being connected by an upper end and a lower end, respectively, to upper and lower shoulder strap attachment portions of the back side of the pack portion;the carrying system further comprises a hip belt, the hip-belt being connected to at least one hip-belt attachment portion of the back side of the pack portion;the frame extends along a region of the back side of the pack portion including at least the upper shoulder straps attachment portions and the hip-belt attachment portion of the back side of the pack portion. 3. A backpack according to claim 2, wherein: a part of the hip-belt is non-removably adhesively bonded to the back side of the pack portion. 4. A backpack according to claim 1, wherein: the frame is non-removably adhesively bonded to an inner surface of the back side of the pack portion. 5. A backpack according to claim 1, wherein: at least at the shoulder strap attachment portion of the back side of the pack portion, the rigid or semi-rigid sheet of the frame is substantially flat; anda continuous and integral contact, with no void, exists between the adhesive bond of the frame and the adhesive bond of the shoulder strap attachment portion of the back side of the pack portion. 6. A backpack according to claim 1, wherein: the frame has an outer surface area that is less than an outer surface area of the back side of the pack portion of the backpack. 7. A backpack according to claim 1, wherein: the adhesive bond between the frame and the back side of the pack portion bonds the frame to an inner surface of the back side of the pack portion, the carrying system being directly connected to the pack portion. 8. A backpack according to claim 1, wherein: the adhesive bond between the frame and the back side of the pack portion bonds the frame to an outer surface of the back side of the pack portion, the carrying system being indirectly connected to the pack portion. 9. A backpack according to claim 1, wherein: the flexible material of the pack portion is a fabric. 10. A backpack according to claim 1, wherein: the frame further comprises a sheet of elastically compressible foam;the rigid or semi-rigid sheet is a sheet of plastic material adhesively bonded to the sheet of elastically compressible foam. 11. A backpack comprising: a pack portion made of flexible material and including a back side, an inner compartment to accommodate a load to be carried during use of the backpack, the inner compartment being demarcated at least in part by the back side;a carrying system directly or indirectly connected to the pack portion and comprising at least one carrying strap;the carrying strap comprising an anchoring part for anchoring the carrying strap to a shoulder strap attachment portion of the back side of the pack portion;a thermo-activated glue or glue-containing compound between the anchoring part of the carrying strap and the shoulder strap attachment portion of the back side of the pack portion;a frame connected to the pack portion;the frame comprising: at least a rigid or semi-rigid sheet, the sheet being more rigid than the flexible material of the pack portion, and a sheet of elastically compressible foam;said frame being adhesively bonded to the back side of the pack portion by an adhesive bond between the frame and the back side of the pack portion;the adhesive bond between the sheet and the back side of the pack portion comprising a thermo-activated glue or glue-containing compound between the frame and the back side of the pack portion;the glue or gluing compound between the anchoring part of the carrying strap and the shoulder strap attachment portion of the back side of the pack portion being positioned at a distance from a reference point on the pack portion equal to a distance from the reference point the adhesive bond between the frame and the back side of the pack portion is positioned. 12. A backpack according to claim 11, wherein: the glue or glue-containing compound between the frame and the back side of the pack portion comprises at least one interfacial layer between two adhesive films. 13. A backpack according to claim 11, wherein: separation of the frame and the back side of the pack portion requires undoing the adhesive bond between the frame and the back side of the pack portion. 14. A backpack according to claim 11, wherein: the frame is adhesively bonded, by means of the thermo-activated glue or glue-containing compound, to an inner surface of the back side of the pack portion. 15. A backpack according to claim 11, wherein: the flexible material of the pack portion is a fabric. 16. A backpack according to claim 11, wherein: the thermo-activated glue or glue-containing compound between the sheet and the back side of the pack portion is a thermo-activated adhesive film. 17. A pack comprising: a pack portion made of flexible material, the pack portion including a back side and an inner compartment to accommodate a load to be carried during use of the backpack, the inner compartment being demarcated at least in part by the back side;a carrying system comprising a strap connected to an outer surface of the pack portion at at least two distinct attachment portions of the outer surface of the pack portion;a frame connected to the an inner surface of pack portion;the sheet comprising at least a rigid or semi-rigid sheet, the frame being more rigid than the flexible material of the pack portion, and a sheet of elastically compressible foam;the frame being affixed to the pack portion by an adhesive bond between the frame and the pack portion and which underlies and extends between both attachment portions;the adhesive bond between the frame and the pack portion comprising a thermo-activated glue or glue-containing compound;the strap of the carrying system comprising an anchoring part connected to the pack portion by an adhesive bond between the carrying system and at least one of the attachment portions of the outer surface of the pack portion;the adhesive bond between the carrying system and the at least one of the attachment portions of the outer surface of the pack portion comprising a thermo-activated glue or glue-containing compound;the anchoring part of the carrying system and the adhesive bond between the frame and the back side of the pack portion being positioned an equal distance from a reference point on the pack portion. 18. A pack according to claim 17, wherein: the pack portion is made of flexible waterproof material. 19. A backpack according to claim 18, wherein: the flexible waterproof material of the pack portion comprises a plurality of panels joined together along junction lines protected for resistance to ingression of water. 20. A pack according to claim 17, wherein: the pack portion is made of flexible waterproof material having an outer polyurethane coating having a peeling resistance of at least 10 pounds per inch according to Federal Test Method Standard 191A/5970. 21. A pack according to claim 17, wherein: separation of the frame and the back side of the pack portion requires undoing the adhesive bond between the frame and the back side of the pack portion. 22. A pack according to claim 17, wherein: the flexible material of the pack portion is a fabric. 23. A backpack comprising: a pack portion made of flexible material, the pack portion including a back side and an inner compartment to accommodate a load to be carried during use of the backpack, the inner compartment being demarcated at least in part by the back side;a carrying system directly or indirectly connected to the pack portion and comprising at least a pair of shoulder straps and a hip-belt;a frame connected to the pack portion, the frame extending along a region of the back side including at least an upper shoulder straps attaching portion and a lumbar portion of the back side of the pack portion;the frame comprising at least a rigid or semi-rigid sheet, the sheet being more rigid than the flexible material of the pack portion, and a sheet of elastically compressible foam;a thermo-activated glue or glue-containing compound between an anchoring part of one of the pair of shoulder straps and the shoulder straps attaching portion of the frame;the frame being affixed to the back side of the pack portion by an adhesive bond between the frame and the back side of the pack portion;the glue or glue-containing compound between the anchoring part of one of the pair of shoulder straps and the shoulder straps attachment portion of the back side of the pack portion being positioned at a distance from a reference point on the pack portion equal to a distance from the reference point the adhesive bond between the frame and the back side of the pack portion is positioned;the hip-belt being connected to the pack portion by a pivot connection mechanism;the pivot connection mechanism comprising at least one pivot part which is affixed to the back side of the pack portion by an adhesive bond between the pivot part and the back side of the pack portion at the lumbar portion of the back side of the pack portion. 24. A backpack according to claim 23, wherein: the pivot part which is affixed to the back side of the pack comprises a base part with a peripheral outer flexible flange. 25. A backpack according to claim 24, wherein: the flexible flange is integral with the base part of the pivot part. 26. A backpack according to claim 23, wherein: separation of the frame and the back side of the pack portion requires undoing the adhesive bond between the frame and the back side of the pack portion. 27. A backpack according to claim 23, wherein: the frame is adhesively bonded, by means of the thermo-activated glue or glue-containing compound, to an inner surface of the back side of the pack portion. 28. A backpack according to claim 23, wherein: the flexible material of the pack portion is a fabric. 29. A backpack comprising: a pack portion made of flexible material and including a back side, an inner compartment to accommodate a load to be carried during use of the backpack, the inner compartment being demarcated at least in part by the back side;a carrying system directly or indirectly connected to the pack portion and comprising at least one shoulder strap connected by an anchoring part of an upper end to an upper shoulder strap attachment portion of the back side of the pack portion;a frame connected to the pack portion, the frame extending along a region of the back side including at least the upper shoulder strap attachment portion and a lumbar portion of the back side;the frame comprising at least a rigid or semi-rigid sheet frame, the sheet being more rigid than the flexible material of the pack portion, and a sheet of elastically compressible foam;the frame being adhesively bonded to the back side of the pack portion by an adhesive bond between the frame and the back side of the pack portion;the adhesive bond between the frame and the back side of the pack portion comprising a thermo-activated glue or glue-containing compound;the anchoring part of the upper end of the shoulder strap being directly or indirectly adhesively bonded to the back side of the pack portion by an adhesive bond between the anchoring part of the upper end of the shoulder strap and the respective attachment portion of the back side of the pack portion;the adhesive bond between the anchoring part of the upper end of the shoulder strap and the respective attachment portion of the back side of the pack portion comprising a thermo-activated glue or glue-containing compound;the anchoring part of the upper end of the shoulder strap and the adhesive bond between the frame and the back side of the pack portion being positioned an equal distance from a reference point on the pack portion. 30. A backpack according to claim 29, further comprising: a hip-belt connected to the pack portion via a pivot connection mechanism. 31. A backpack according to claim 30, wherein: the pivot connection mechanism comprises at least one pivot part affixed to the back side of the pack portion by adhesive bonding. 32. A backpack according to claim 31, wherein: the pivot part which is affixed to the back side of the pack comprises a base part with a peripheral outer flexible flange. 33. A backpack according to claim 32, wherein: the flexible flange is integral with the base part of the pivot part. 34. A backpack according to claim 29, wherein: the at least one shoulder strap of the carrying system comprises a pair of shoulder straps, each said shoulder strap being connected by an upper end and a lower end, respectively, to upper and lower shoulder strap attachment portions of the back side of the pack portion;the carrying system further comprises a hip belt, the hip-belt being connected to at least one hip-belt attachment portion of the back side of the pack portion; andthe frame extends along a region of the back side of the pack portion including at least the upper shoulder straps attachment portions and the hip-belt attachment portion of the back side of the pack portion. 35. A backpack according to claim 34, wherein: the hip-belt is connected to the pack portion by an adhesive bond between the hip-belt and the pack portion. 36. A backpack according to claim 34, wherein: the frame is substantially uniformly adhered along a substantial part of a surface in contact with the back side of the pack portion. 37. A backpack according to claim 29, wherein: the thermo-activated glue or glue-containing compound between the frame and the back side of the pack portion is a thermo-activated adhesive film. 38. A backpack according to claim 37, wherein: the frame is adhered to the back side of the pack portion via a gluing compound comprising at least one interfacial layer between two adhesive films. 39. A backpack according to claim 29, wherein: the rigid or semi-rigid sheet of the frame is subdivided in at least two sheet frame elements each adhered to the back side of the pack portion. 40. A backpack according to claim 39, wherein: the sheet elements are connected one to another by a rigid structure. 41. A backpack according to claim 29, wherein: the pack portion is made of flexible waterproof material. 42. A backpack according to claim 41, wherein: the flexible waterproof material of the pack portion comprises a plurality of panels joined together along junction lines protected for resistance to ingression of water. 43. A backpack according to claim 29, wherein: the frame is adhesively bonded to an inner surface of the back side of the pack portion. 44. A backpack according to claim 29, wherein: the adhesive bond bonds the frame to an outer surface of the back side of the pack portion so that the carrying system is indirectly connected to the pack portion via the frame. 45. A backpack according to claim 29, wherein: the rigid or semi-rigid sheet of the frame is unitary. 46. A backpack according to claim 29, wherein: the rigid or semi-rigid sheet of the frame includes a sheet of plastic material. 47. A backpack according to claim 29, wherein: rigid or semi-rigid sheet comprises a plastic material adhesively bonded to a sheet of elastically compressible foam. 48. A backpack according to claim 29, wherein: the sheet frame is reinforced by at least one rigid rod. 49. A backpack according to claim 29, wherein: the pack portion is made of flexible waterproof material having an outer polyurethane coating having a peeling resistance of at least 10 pounds per inch according to Federal Test Method Standard 191A/5970. 50. A backpack according to claim 29, wherein: separation of the frame and the back side of the pack portion requires undoing the adhesive bond between the frame and the back side of the pack portion. 51. A backpack according to claim 29, wherein: at least at the shoulder strap attachment portion of the back side of the pack portion, the rigid or semi-rigid sheet of the frame is substantially flat; anda continuous and integral contact, with no void, exists between the adhesive bond of the frame and the adhesive bond of the shoulder strap attachment portion of the back side of the pack portion. 52. A backpack according to claim 29, wherein: the frame has an outer surface area that is less than an outer surface area of the back side of the pack portion of the backpack. 53. A backpack according to claim 29, wherein: the flexible material of the pack portion is a fabric. 54. A backpack according to claim 29, wherein: the carrying system further comprises at least one load stabilizing strap having a lower end attached to the shoulder strap and an upper end attached to a stabilizing strap attachment portion of the back side of the pack portion;the frame has an upper end terminating above the stabilizing strap attachment portion of the back side of the pack portion. 55. A method of manufacturing a backpack according to claim 29, said method comprising: applying an adhesive bond between the sheet frame and the back side of the pack portion of the backpack by heating a thermo-activated glue or glue-containing compound situated between the sheet frame and the back side of the pack portion of the backpack; andapplying an adhesive bond between the anchoring part of the upper end of the shoulder strap and the attachment portion of the back side of the pack portion of the backpack by heating a thermo-activated glue or glue-containing compound situated between the anchoring part of the upper end of the shoulder strap and the attachment portion of the back side of the pack portion of the backpack.