Collapsible Silicone 26oz Water Bottle (Set of 2) with Flip-Top Cap - Reusable Durable Foldable Leak-Proof Sports Canteen for Camping Hiking Cycling Yoga Crossfit Air Travel - EXTRA LIDs Included SAFE TO USE - This is Medical Grade, 26oz Silicone Water Bottle, BPA Free, FDA (USA) and LFGB (Germany) approved. Can be used with one hand, where you squeeze it to drink (you can remove the valve, to drink normally if you want). The cap is also BPA Free, PP Plastic. SPACE-EFFICIENT - Foldable (by rolling it up) and using the included band to keep it folded. LARGE OPENING - The bottle has a large hole, so it shouldn't be a problem to put ice cubes in it (1.8in/4.5cm (insert says 1.9in/5cm which is the outer, hole itself is about 1.8in/4.5cm)). You can also put the bottle in the freezer, but note that if you drink by squeezing, with frozen water you have to wait a while before you can drink. SMART CAP - The cap has a smart spring design to keep it open while you drink. The cap has a button which will easily let you open it up with just one hand. It also has a metal half-ring to lock the cap and stop it from opening accidentally. Cap also has a spill-proof valve and a valve to collect air so you can squeeze again to drink. EXTRA CAPS - Each bottle is individually packed in clear poly bag with an extra cap, shipped as a set of two bottles with a nice insert. You will get two dark gray caps and one extra blue and pink cap. That way you can mix it up however you want.