Flexible: Stand upright when full, fold, roll or flatten when empty. Convenience: This hydration bag can be folded, rolled up or flattened to stand when full. You can take it anywhere, anytime. very happy. Material: Plastic material, safe, non-toxic, light weight, reusable, healthy and environmentally friendly. Leak-proof and fail-safe. Flexible use: When the water bottle is empty, it can be flattened or rolled up. Once filled with water, it can be hung with hooks. Wide range of applications: Best for camping, hiking, cycling, running, jogging, gym workouts, summer camps or traveling. Color: Black, Blue, White, Red Material: PE+PA+PET Capacity: 700ml Weight: 39g Size: 23*13cm PACKAGE CONTENTS 4 Pack 700ml Collapsible Water Bottle.