Patent ID: 7975880

Claim:
A hydration system comprising: a pack storing a reservoir and a portion of a hose; the pack comprising a fitted compartment configured to receive the reservoir, the fitted compartment having a shape that substantially corresponds to the reservoir; the pack including a front panel and a rear panel; the reservoir including a front side and a rear side; the front side and the front panel configured to be disposed closer to the wearer than the rear side; wherein the rear side and the front side are displaced a first distance when the reservoir contains a first volume of liquid; wherein the rear side is configured to contract towards the front panel of the pack as the first volume of liquid is reduced; wherein the front side is configured to remain substantially stationary proximate the front panel of the pack as the first volume of liquid is reduced; wherein the front side and the rear side are associated with a first stiffness; wherein the reservoir further includes a first side and a second side, the first side and the second side being associated with a second stiffness; wherein the first stiffness is greater than the second stiffness; and wherein the front side and the rear side remain generally parallel as the rear side contracts towards the front panel.