ReadyShaker&trade; - The First Disposable Protein Shaker (2 Pack) Ultra Thin: at 320 microns thick, it easily fits in your pocket Large 3-7/8 in. top opening: no funnels needed for loading 14 fluid-oz capacity: for diverse supplement options Self-standing: bottom unfolds allowing shaker to stand when full Safe, washable, recyclable materials: BPA-free & Phthalate-free