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The present application relates to a device for dispensing product and a related method of using the device, the device comprising a flexible walled pouch configured to contain product. The pouch may be in fluid communication with an airless pump equipped with a dip tube having a free end that lies

The present application relates to a device for dispensing product and a related method of using the device, the device comprising a flexible walled pouch configured to contain product. The pouch may be in fluid communication with an airless pump equipped with a dip tube having a free end that lies substantially mid-way along the axial height of the pouch. The pouch may be in a container.

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What is claimed is: 1. A device for dispensing a product, comprising: a container; a flexible-walled pouch inside the container, the flexible-walled pouch comprising an interior; a product contained in the interior of the pouch; a dip tube extending in the interior of the pouch, the dip tube having

What is claimed is: 1. A device for dispensing a product, comprising: a container; a flexible-walled pouch inside the container, the flexible-walled pouch comprising an interior; a product contained in the interior of the pouch; a dip tube extending in the interior of the pouch, the dip tube having a free end located substantially at a mid-point of an axial height of the pouch, the dip tube having an opening at the free end of the dip tube, the opening being the only inlet for the flow of product into the dip tube; an airless pump in fluid communication with the interior of the flexible-walled pouch via the dip tube; and at least one passage configured to allow air entry into the container and outside of the pouch, wherein pressure in the interior of the pouch, at least prior to first use of the device, is less than or substantially equal to atmospheric pressure, and wherein the device is configured so that, as product is pumped from the interior of the pouch, a volume defined by the interior of the pouch above the free end of the dip tube is substantially equal to a volume defined by the interior of the pouch below the free end of the dip tube. 2. The device of claim 1, wherein the passage is configured to allow the air entry as the product is pumped from the pouch. 3. The device of claim 1, wherein said pouch is fixed longitudinally to an interior of the container along at least one fixing region. 4. The device of claim 3, wherein the pouch and the at least one fixing region are configured so that as product is pumped from inside the interior of the pouch, a volume defined by the pouch decreases while cross sections of the pouch located along at least a portion of its axial height remain substantially symmetrical with respect to a mid cross sectional plane containing the free end of the dip tube. 5. The device of claim 4, wherein the device is configured so that as the product is pumped from the interior of the pouch, cross sections of the pouch located along said at least a portion of its axial height maintain a substantially symmetric shape with respect to an axis containing the dip tube. 6. The device of claim 1, wherein the pouch is configured to move from a first position, wherein the pouch defines a maximum volume, to a second position, wherein the pouch defines a minimum volume. 7. The device of claim 6, wherein said pouch, when in the second position, is close to the dip tube along at least one longitudinal region. 8. The device of claim 6, wherein said pouch, when in the second position, contacts the dip tube along at least one longitudinal position. 9. The device of claim 6, wherein an internal cross shape defined by the container is similar to a shape of the pouch when the pouch is in the first position. 10. The device of claim 3, wherein the at least one fixing region comprises a plurality of fixing regions, and wherein the pouch and the plurality of fixing regions are configured so that a profile of a portion of the pouch extending between two adjacent fixing regions deforms substantially symmetrically with respect to a plane passing through an axis of the dip tube and a midpoint between the two adjacent fixing regions. 11. The device of claim 3, wherein the at least one fixing region extends continuously along substantially the entire height of the pouch. 12. The device of claim 6, wherein cross sections of the pouch have a symmetric shape about an axis. 13. The device of claim 12, wherein the pouch has at least four sides when the pouch is in the first position. 14. The device of claim 13, wherein the pouch is fixed to the container along N longitudinal fixing regions. 15. The device of claim 14, wherein N is greater than or equal to three. 16. The device of claim 12, wherein when the pouch is in the first position, the pouch has a square shaped cross section having four sides with a longitudinal fixing region being located at the middle of each of the four sides. 17. The device of claim 1, wherein a cross sectional area defined by the pouch is at a maximum substantially at the mid-point of the axial height of the pouch and decreases gradually away from the mid-point. 18. The device of claim 1, wherein the at least one passage comprises one or more orifices formed in a bottom of the external container. 19. The device of claim 18, wherein the orifices comprise slots. 20. The device of claim 1, wherein the device is formed by co-extrusion of a first material forming the container and a second material forming the pouch, the first material being physically and chemically incompatible with the second material. 21. The device of claim 20, wherein the pouch is fixed longitudinally to an interior of the container along at least one fixing region, and wherein the at least one fixing region comprises a third material that is physically and chemically compatible with said first material and second material. 22. The device of claim 21, wherein the third material comprises a thermoplastic. 23. The device of claim 20, wherein the first material is chosen from polyethylene terephthalates, ABSs, and styrenes. 24. The device of claim 20, wherein the second material is chosen from polypropylenes and polyethylenes. 25. The device of claim 21, wherein the third material is a resin. 26. The device of claim 1, wherein the pump is mounted on the device by at least one of crimping and screwing. 27. The device of claim 1, further comprising a dispensing head for actuating the pump and dispensing product via at least one dispensing orifice. 28. The device of claim 1, wherein the product comprises a cosmetic product. 29. The device of claim 28, wherein the cosmetic product is chosen from personal hygiene products, scents, makeup products, hair products, care products, and sunscreens. 30. The device of claim 1, wherein the pouch is formed of a substantially non-elastic material. 31. The device of claim 30, wherein the material is deformable. 32. The device of claim 1, wherein the dip tube is an unperforated cylindrical tube. 33. A device for dispensing a product, comprising: a container; a flexible-walled pouch inside the container, the flexible-walled pouch comprising an interior configured to contain the product; a dip tube extending in the interior of the pouch, the dip tube having a free end located substantially at a mid-point of an axial height of the pouch, the dip tube having an opening at the free end of the dip tube, the opening being the only inlet for the flow of product into the dip tube; an airless pump in fluid communication with the interior of the flexible-walled pouch via the dip tube; and at least one passage configured to allow air entry into the container and outside of the pouch, wherein a cross sectional area defined by the pouch is at a maximum substantially at the mid-point of the axial height of the pouch, and decreases gradually away from the mid-point, and wherein the flexible pouch comprises a substantially non-elastically deformable material. 34. The device of claim 33, wherein the passage is configured to allow the air entry as the product is pumped from the pouch. 35. The device of claim 33, wherein said pouch is fixed longitudinally to an interior of the container along at least one fixing region. 36. The device of claim 35, wherein the pouch and the at least one fixing region are configured so that, as product is pumped from the interior of the pouch, a volume defined by the interior of the pouch above the free end of the dip tube is substantially equal to a volume defined by the interior of the pouch below the free end of the dip tube. 37. The device of claim 35, wherein the pouch and the at least one fixing region are configured so that as product is pumped from inside the interior of the pouch, a volume defined by the pouch decreases while cross sections of the pouch located along at least a portion of its axial height remain substantially symmetrical with respect to a mid cross sectional plane containing the free end of the dip tube. 38. The device of claim 37, wherein the pouch and the at least one fixing region are configured so that as the product is pumped from the interior of the pouch, cross sections of the pouch located along said at least a portion of its axial height maintain a substantially symmetric shape with respect to an axis containing the dip tube. 39. The device of claim 33, wherein the pouch is configured to move from a first position, wherein the pouch defines a maximum volume, to a second position, wherein the pouch defines a minimum volume. 40. The device of claim 39, wherein said pouch, when in the second position, is close to the dip tube along at least one longitudinal region. 41. The device of claim 39, wherein said pouch, when in the second position, contacts the dip tube along at least one longitudinal position. 42. The device of claim 39, wherein an internal cross shape defined by the container is similar to a shape of the pouch when the pouch is in the first position. 43. The device of claim 35, wherein the at least one fixing region comprises a plurality of fixing regions, and wherein the pouch and the plurality of fixing regions are configured so that a profile of a portion of the pouch extending between two adjacent fixing regions deforms substantially symmetrically with respect to a plane passing through an axis of the dip tube and a midpoint between the two adjacent fixing regions. 44. The device of claim 35, wherein the at least one fixing region extends continuously along substantially the entire height of the pouch. 45. The device of claim 39, wherein cross sections of the pouch have a symmetric shape about an axis. 46. The device of claim 45, wherein the pouch has at least four sides when the pouch is in the first position. 47. The device of claim 46, wherein the pouch is fixed to the container along N longitudinal fixing regions. 48. The device of claim 47, wherein N is greater than or equal to three. 49. The device of claim 45, wherein when the pouch is in the first position, the pouch has a square shaped cross section having four sides with a longitudinal fixing region being located at the middle of each of the four sides. 50. The device of claim 33, wherein a cross sectional area defined by the pouch is at a maximum substantially at the mid-point of the axial height of the pouch and decreases gradually away from the mid-point. 51. The device of claim 33, wherein the at least one passage comprises one or more orifices formed in a bottom of the external container. 52. The device of claim 51, wherein the orifices comprise slots. 53. The device of claim 33, wherein the device is formed by co-extrusion of a first material forming the container and a second material forming the pouch, the first material being physically and chemically incompatible with the second material. 54. The device of claim 53, wherein the pouch is fixed longitudinally to an interior of the container along at least one fixing region, and wherein the at least one fixing region comprises a third material that is physically and chemically compatible with said first material and second material. 55. The device of claim 54, wherein the third material comprises a thermoplastic. 56. The device of claim 53, wherein the first material is chosen from polyethylene terephthalates, ABSs, and styrenes. 57. The device of claim 53, wherein the second material is chosen from polypropylenes and polyethylenes. 58. The device of claim 54, wherein the third material is a resin. 59. The device of claim 33, wherein the pump is mounted on the device by at least one of crimping and screwing. 60. The device of claim 33, further comprising a dispensing head for actuating the pump and dispensing product via at least one dispensing orifice. 61. The device of claim 33, further comprising product contained in the interior of the pouch, wherein the product comprises a cosmetic product. 62. The device of claim 61, wherein the cosmetic product is chosen from personal hygiene products, scents, makeup products, hair products, care products, and sunscreens. 63. The device of claim 33, wherein the dip tube is an unperforated cylindrical tube. 64. A device for dispensing a product, comprising: a container; a flexible-walled pouch inside the container, the flexible-walled pouch comprising an interior configured to contain the product; a dip tube extending in the interior of the pouch, the dip tube having a free end located substantially at a mid-point of an axial height of the pouch; an airless pump in fluid communication with the interior of the flexible-walled pouch via the dip tube; and at least one passage configured to allow air entry into the container and outside of the pouch, wherein said pouch is fixed longitudinally to an interior wall of the container along at least one fixing region, wherein a cross sectional area defined by the pouch is at a maximum substantially at the mid-point of the axial height of the pouch, and decreases gradually away from the mid-point, and wherein the pouch and the at least one fixing region are configured so that, as product is pumped from the interior of the pouch, a volume defined by the interior of the pouch above the free end of the dip tube is substantially equal to a volume defined by the interior of the pouch below the free end of the dip tube. 65. The device of claim 64, wherein the passage is configured to allow the air entry as the product is pumped from the pouch. 66. The device of claim 64, wherein the pouch and the at least one fixing region are configured so that as product is pumped from inside the interior of the pouch, a volume defined by the pouch decreases while cross sections of the pouch located along at least a portion of its axial height remain substantially symmetrical with respect to a mid cross sectional plane containing the free end of the dip tube. 67. The device of claim 66, wherein the pouch and the at least one fixing region are configured so that as the product is pumped from the interior of the pouch, cross sections of the pouch located along said at least a portion of its axial height maintain a substantially symmetric shape with respect to an axis containing the dip tube. 68. The device of claim 64, wherein the pouch is configured to move from a first position, wherein the pouch defines a maximum volume, to a second position, wherein the pouch defines a minimum volume. 69. The device of claim 68, wherein said pouch, when in the second position, is close to the dip tube along at least one longitudinal region. 70. The device of claim 68, wherein said pouch, when in the second position, contacts the dip tube along at least one longitudinal position. 71. The device of claim 68, wherein an internal cross shape defined by the container is similar to a shape of the pouch when the pouch is in the first position. 72. The device of claim 64, wherein the at least one fixing region comprises a plurality of fixing regions, and wherein the pouch and the plurality of fixing regions are configured so that a profile of a portion of the pouch extending between two adjacent fixing regions deforms substantially symmetrically with respect to a plane passing through an axis of the dip tube and a midpoint between the two adjacent fixing regions. 73. The device of claim 64, wherein the at least one fixing region extends continuously along substantially the entire height of the pouch. 74. The device of claim 68, wherein cross sections of the pouch have a symmetric shape about an axis. 75. The device of claim 74, wherein the pouch has at least four sides when the pouch is in the first position. 76. The device of claim 75, wherein the pouch is fixed to the container along N longitudinal fixing regions. 77. The device of claim 76, wherein N is greater than or equal to three. 78. The device of claim 68, wherein when the pouch is in the first position, the pouch has a square shaped cross section having four sides with a longitudinal fixing region being located at the middle of each of the four sides. 79. The device of claim 64, wherein the dip tube has an opening at the free end of the dip tube, the opening being the only inlet for the flow of product into the dip tube. 80. The device of claim 64, wherein the dip tube is an unperforated cylindrical tube. 81. The device of claim 64, wherein the at least one passage comprises one or more orifices formed in a bottom of the external container. 82. The device of claim 81, wherein the orifices comprise slots. 83. The device of claim 64, wherein the device is formed by co-extrusion of a first material forming the container and a second material forming the pouch, the first material being physically and chemically incompatible with the second material. 84. The device of claim 83, wherein the pouch is fixed longitudinally to an interior of the container along at least one fixing region, and wherein the at least one fixing region comprises a third material that is physically and chemically compatible with said first material and second material. 85. The device of claim 84, wherein the third material comprises a thermoplastic. 86. The device of claim 83, wherein the first material is chosen from polyethylene terephthalates, ABSs, and styrenes. 87. The device of claim 83, wherein the second material is chosen from polypropylenes and polyethylenes. 88. The device of claim 84, wherein the third material is a resin. 89. The device of claim 64, wherein the pump is mounted on the device by at least one of crimping and screwing. 90. The device of claim 64, further comprising a dispensing head for actuating the pump and dispensing product via at least one dispensing orifice. 91. The device of claim 64, further comprising product contained in the interior of the pouch, wherein the product comprises a cosmetic product. 92. The device of claim 91, wherein the cosmetic product is chosen from personal hygiene products, scents, makeup products, hair products, care products, and sunscreens. 93. The device of claim 64, wherein the pouch is formed of a substantially non-elastic material. 94. The device of claim 93, wherein the material is deformable.