Stainless Steel Collapsible Pocket Cup It pops open and is a perfect item for taking on your travels, picnics, concerts, etc, in fact anywhere you might need a cup to drink from. It's ideal for taking medication when on the go. The convenient cover allows it to double as a medication storage container. Opens to 2" tall and holds 2 oz. Closes to a compact 5/8 high. Is 2 in diameter. Made of stainless steel, this cup is rust-proof and sanitary,