Paladineer Outdoor Gear Assault Backpack Mini Tactical Backpack Waterproof Travel Daypack Military Backpack Rucksacks 20L High Quality Material-D600 Nylon, High Abrasion Resistance, Highly Tear Resistant. Headphone jack at the top of the bag, can make the wear from the hole conveniently headsets use. Good air permeability with thickened sponge on the back of the bag. Capable of relieving pressure on shoulders with adjustable shoulder straps. Versatile enough for the everyday and heavy-duty enough for the cycling, hiking, camping, etc.