As per REI's description:
Collapsible water bottle stands on a stable base, yet can be flattened to conform to small spaces and rolls up when empty
* Bottle is made with lightweight, durable 3-ply plastic laminate and welded construction for absolutely secure seams
* Bottle is lined with food-grade polyethylene film that won't flavor your water with a plastic taste
* Bottle is strong and durable-- will survive dropping, freezing and boiling
* Comes with a secure, standard closure screw cap
* Stuffs in a fanny pack or fits in a jacket pocket
Lightweight plastic bottles are sturdy enough to stand up, yet roll up for easy packing when empty. Lining ensures water inside has a clean taste. 1.0 liters. Made in USA.