GoCup expands with a quick pull and collapses to an ultra-compact puck allwith a simple press. Lids on both sizes keep things clean during transport andfeature handy pill holders. The 8 fl. oz. size also features a clever”DoubleDecker” tray that gives you the option of two small chambers (toorganize pills, for example) or one large chamber. The DoubleDecker alsocreates a handy portable pill box you can take on-the-go by itself. Volumemarkings on the cups help to measure fluids. All GoCups are PC-free,phthalate-free, and BPA-free. They’re perfect in any toiletry kit, backpack,book-bag, briefcase, purse.most anywhere.