Kimlee Water-resistance Travel Backpack Hiking Daypack Camping Backpack for Outdoor Sports,35L 35L, 400*800D nylon and polyester material,water resistant,ripstop,durable,perfect for overnight, weekend and three-day excursions The cancellous design separate your back from Backpack to make you feel cool and comfortable when sweating,padded and adjustable shoulder straps reduce your shoulder's pressure Detachable back support system, you can install it when you go hiking,cycling or doing other outdoor activities and take it down as daily backpack,use as schoolbag shopping bag.It is better for lady and child to ask man for help when installing,because the metal of back support system is hard. Approximate Size: L12.6"*H20.1"*W7.1"& Weight: about 2.68 pounds; Unisex, Both for women and men hiking backpacking Free rain cover for weather protection,keep the backpack clean and dry.