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A drinking device including a body having an open end and for containing a liquid, and a lid for sealingly closing the open end of the body. The lid has an outlet incorporating a first one-way valve for dispensing liquid from the body upon the application of suction at the outlet and an inlet incorp

A drinking device including a body having an open end and for containing a liquid, and a lid for sealingly closing the open end of the body. The lid has an outlet incorporating a first one-way valve for dispensing liquid from the body upon the application of suction at the outlet and an inlet incorporating a second one-way valve for air intake to automatically balance the internal pressure within the body with external pressure outside the body while liquid is being dispensed. The first valve includes a chamber having a resiliently deformable wall including a hole in communication with the outlet. The hole is normally closed by being pressed against an internal surface of the body by the resilience of the wall and is openable upon the application of suction.

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1. A drinking device comprising:a body having an open end and for containing a liquid, and a lid for sealingly closing the open end of the body, said lid having an outlet incorporating a first one-way valve for dispensing a liquid from the body through the outlet, upon application of suction to the

1. A drinking device comprising:a body having an open end and for containing a liquid, and a lid for sealingly closing the open end of the body, said lid having an outlet incorporating a first one-way valve for dispensing a liquid from the body through the outlet, upon application of suction to the outlet, and an inlet incorporating a second one-way valve for air intake to automatically balance internal pressure within the body, sealed with the lid, with external pressure outside the body while a liquid is being dispensed through the outlet, wherein the first one-way valve comprises a chamber having a resiliently deformable wall including a hole in communication with the outlet and a resiliently deformable sleeve, and the lid includes a member extending from the outlet within the sleeve and forming the chamber, the member including an internal duct connecting the outlet to the chamber, and, when the body is sealed with the lid, the first one-way valve is normally closed by pressing of the resiliently deformable wall against an internal surface of the body by resilience of the resiliently deformable wall and the first one-way valve is opened upon application of suction to the outlet. 2. The drinking device as claimed in claim 1, wherein the inlet is located in the lid.3. The drinking device as claimed in claim 1, wherein the open end of the body has a rim for engagement with the lid.4. The drinking device as claimed in claim 3, wherein the lid externally engages the rim of the body for sealing the open end of the body.5. The drinking device as claimed in claim 1, wherein the chamber wall has a protruding tubular rim surrounding the hole for engaging the surface of the wall depending from the lid of the body for closing the hole.6. The drinking device as claimed in claim 1, wherein the chamber wall has a protruding tubular rim surrounding the hole for engaging the internal surface of the body for closing the hole.7. The drinking device as claimed in claim 1, wherein the chamber includes a resiliently deformable sleeve, and the lid includes a member extending from the outlet within the sleeve and forming the chamber, the member including an internal duct connecting the outlet to the chamber.8. The drinking device as claimed in claim 7 1, wherein the member has a first end along which the duct extends and a second end supporting the sleeve and including a void directly opposite the hole receiving part of the resiliently deformable wall upon opening of the first one-way valve.9. The drinking device as claimed in claim 7 1, wherein the sleeve has a rectangular box-like body having an open side receiving the member.10. The drinking device as claimed in claim 1, wherein the inlet includes a hole in the lid, and the second one-way valve is a slit valve located in the hole in the lid.11. The drinking device as claimed in claim 1, including a flexible member wherein the first and second one-way valves are integral to and located at opposite ends of the flexible member.12. The drinking device as claimed in claim 1, wherein the outlet includes an upstanding spout in the lid.13. A drinking device comprising:a body having an open end and for containing a liquid, and a lid for sealingly closing the open end of the body, said lid having an outlet incorporating a first one-way valve for dispensing a liquid from the body through the outlet in a direction generally transverse to the lid, upon application of suction to the outlet, an inlet incorporating a second one-way valve for air intake to automatically balance internal pressure within the body, sealed with the lid, with external pressure outside the body while a liquid is being dispensed through the outlet, and a depending wall extending into the body when the body is sealed with the lid, wherein the first one-way valve comprises a chamber having a resiliently deformable wall including a hole in communication with the outlet, the first one-way valve being normally closed by pressing of the resiliently deformable wall against the depending wall depending from the lid, by resilience of the resiliently deformable wall, and the first one-way valve being opened by moving in a direction generally transverse to the outlet, upon application of suction to the outlet. 14. The drinking device as claimed in claim 13, wherein the inlet is located in the lid.15. The drinking device as claimed in claim 13, wherein the open end of the body has a rim for engagement with the lid.16. The drinking device as claimed in claim 15, wherein the lid externally engages the rim of the body for sealing the open end of the body.17. The drinking device as claimed in claim 13, wherein the chamber includes a resiliently deformable sleeve, and the lid includes a member extending from the outlet within the sleeve and forming the chamber, the member including an internal duct connecting the outlet to the chamber.18. The drinking device as claimed in claim 17, wherein the member has a first end along which the duct extends and a second end supporting the sleeve and including a void directly opposite the hole receiving part of the resiliently deformable wall upon opening of the hole.19. The drinking device as claimed in claim 17, wherein the sleeve has a rectangular box-like body having an open side receiving the member.20. The drinking device as claimed in claim 13, wherein the inlet includes a hole in the lid, and the second valve is a one-way slit valve located in the hole in the lid.21. The drinking device as claimed in claim 13, including a flexible member wherein the first and second one-way valves are integral to and located at opposite ends of the flexible member.