Durable and water resistant 630 Denier High-Density Oxford Nylon fabric with TPU coated frontside and PU coated backside, YKK zippered front drop-tray storage with internal and external Velcro fly patch locations plus two internal drop-in mesh pockets, Large-capacity YKK zippered main storage, The Hyplalon tool docking station on the side and webbing loops on the shoulder strap provide optimized accessory attachment locations, Quick-release adjustable strap buckle and padded mesh-lined shoulder strap for a comfortable fit, Stuff mesh storage pocket located on the underside for water bottles or packable rain jackets.