This ingenious collapsible cup transforms from a compact 2.5cm flat profile to a full 250ml capacity vessel with a simple pop-open action. Constructed from BPA-free TPE (thermoplastic elastomer), it provides reliable durability while remaining lightweight at just 25 grams. The fold design prevents dripping after emptying and creates an incredibly space-efficient solution for backpacking, camping, and travel where every gram and cubic centimeter matters.