waterproofed material, with rain cover, can loading blanket clothes, books, hiking tools, and so on...... Item Number:YM-B12005Size: (L*W*H)40*25*56CMMaterial:waterproofed 600Dwith water bottle holder, with rain cover, can loading blanket clothes, books, hiking tools, and so on......it's ok for put customer design logo on bag. hiking backpack YM-M12005