CoolooC Foldable Packable Backpack Lightweight Travel Hiking Dackpack Casual Foldable, Packable, Durable, Ultra-lightweight Waterproof & Tear-resistant Bright Colored Nylon Fabric. Lightweight(0.33lbs) but strong enough nylon fabric, compact(folding size only 9inch*5.5inch) but roomy (capacity:20L unfolding size:16.54in*12in*6.3in) enough for daily use. Good compartment & organization: The backpack has a roomy main compartment while a inner slip pocket to keep cards, keys etc. 2 sides mesh pockets with strap closure for water bottle or umbrella etc. A 9inch*7inch size outside front zippered pocket to hold belongings easy to access, it's also used as the fold pocket. There're 2 reflective tapes on both sides to keep you safe at night. Breathable mesh stretch shoulder straps, easy to adjust the length and firmly lock. Occasions: Daily use, casual, short trips, Gym, Swimming, hiking, vacation, camping, shopping and school.