1.Size:Capacity 78 liters,weight:3.75 lbs,size:27.6H x15.7L x11W inches,which helps you easily organize your items.There are 3 colors:red,blue,black for you to choose. 2.Material:Made from durable eco-friendly waterproof nylon and polyester fabric,long-lasting durability. 3.Adjustable dimensions and multiple suspension systems:Wide adjustable shoulder straps and chest straps ensure good load-bearing distribution,while padding on the back of the backpack ensures stability. 4.Unique design:Breathable exterior frame hiking backpack,Ergonomic padded shoulder straps and back support to make you feel more comfortable.A 20W foldable solar panel charger and the batteries deliver up to 24% conversion rates.