Altosy 30l Mini Hiking Camping Daypack Outdoor Waterproof Travel Backpacks Adult Pack School Bag 2206 polyester Imported BIG FEATURE:Mini hiking daypack, 30L. Can be use for 2 ways: hiking daypacks, and school bag when you remove back suspension system Powever removable suspension system, breathable perspiration, relieve burdened Powerful Bear Breathable System, the heat could quickly spread out, avoiding the embarrassment of sweat, also it's more comfortable for your back A front pocket for small thing or rain cover, A big top pocket, 2 Hipbelt Pockets cell phone/MP3 player Capicity: 30L,suspension system can be take off and can add 5L. Size: 54x34x16(21.3"13.4"x6.3") material:waterproof nylon