A pocket cup for backpacking, tailgating and glovebox duty. Closed it is a flat metal disc; pulled open it becomes a 140 ml tumbler with a smooth drinking rim, measuring 7.5 x 6 cm when extended.
The body is rust-resistant stainless steel, safe for food contact and finished in plain silver with no coating to flake. When the cup is open the rings seat snugly into one another, which is what keeps liquid in rather than seeping between the sections.
