Collapsible canteen for producing a beverage

A collapsible canteen adapted to produce, in situ, a beverage when the canteen is in its erected state, said canteen comprising:

• A. a collapsible carton having foldable side walls and a neck projecting from a top wall on which is received a removable cap;
• B. a collapsible pouch within the carton formed of flexible film material having an open mouth joined to the underside of the top wall in alignment with the neck;
• and
• C. a charge of concentrate deposited in the pouch whereby when the canteen is in a collapsed state, the pouch and the charge therein within the carton are then flattened, and when the canteen is in an erected state and the cap is then removed, liquid may be poured into the pouch to dissolve the concentrate to produce a beverage whose nature depends on the nature of the concentrate, the side walls of the carton being formed by a first pair of opposed side walls extending between and bridging top and bottom walls and being inwardly foldable in half whereby when the carton is collapsed, the folded-in first pair of walls is then sandwiched between said top and bottom walls, and a second pair of opposed side walls extending between and bridging the top and bottom walls and being outwardly foldable in half, each of the second pair of side walls being provided with a triangular gusset joined to a corresponding side wall in the first pair of walls whereby when the carton is collapsed, the gussets are then folded into the folded out second pair of side walls to define a pair of outstretched wings.