Our "Challenger Pro" Backpack is built to bring you durability and water-resistance thanks to its high quality polyester fabric. We added ergonomic padded back panels with air-mesh finishing to provide you the best comfort. In the same way, the adjustable shoulder straps benefit from a spreadable foam. Result: all the stress on your shoulders and your back is completely minimize. Everything inside was designed to allows you to combine soft training and everyday life: - First, a computer storage can keep and protect a 17" laptop and hold it in place with a Velcro closure. Plus a specific hidden MP3 player pocket with a headphones opening to listen music on your way to your gym! - Secondly, the main large zip compartment can gather your gym equipment, shoes or books. - Thirdly, the half-zip front pocket offers several organized sections so all your stuff stays in place. Add to this a bottle storage with a fastening laces system closure, to transport your beverage with peace of mind. And we can continue like this all day long... Technical features: - Water and hard resistant polyester fabric. - Laptop storage pocket fits up to 17". - Specific MP3 player pocket. - Large main zip compartment. - Half-zip front pocket with multiple storage space. - Bottle storage with laces system closure. - Ergonomic padded with mesh panels. - Adjustable shoulder straps with foam padding. - Zip closures with Venum zip pullers. - Removable hook for your keys. - Size: 300 x 500 x 150 mm.