TOPSKY Oxking Outdoor Hiking Backpack Daypacks Waterproof Professional Mountaineering Backpack T30621 Shoulder Bag 40L-60L High Cpacity Unisex Trekking Travel Bag Rucksack Multi Color Large capacity of 40L-60L,Breathable S-type strap,mesk belt,Outside with D-type fasteners Large front pocket, multiple zippered side pockets, and multiple elastic bands, inside including a Laptop layer Supwer carrying-TCS professional adjustable weight decompsition sytem, Safety Belt-carrying back system uses specially thickened waist made of sponge, while better protecting your waist, your weight decomposition in travel, and it the waist band covered with mesh, it's more comfortable for your pack Powerful Bear Breathable System, the heat could quickly spread out, avoiding the embarrassment of sweat, also it's more comfortable for your back Rainproof surface, good for outdoor sports