The Tigernu T-B3221 15.6″ Laptop Backpack is a Backpack for 15.6″ devices, holding a total volume of 25L and weighing just 0.923kg. This model is Grey in colour and has the following features: Anti-Theft, Dual Zip, Glasses Holder, Luggage Strap, Secret Pocket, Shoulder Strap Pocket, Splash-Proof, USB.Our patented Dual Zip technology, keeps your bag secure with a double layer of reinforced teeth creating an anti-theft barrier. The dual zip also creates a water-tight barrier between the surface of the bag and your valuables inside.Glasses Holder:Keep your glasses handy and out of danger, by hanging them from specially designed loops attached to the straps of your backpack.Luggage Strap:Make travelling a breeze, with luggage straps enabling you to mount your backpack on any trolleybag featuring an extending arm. These extra strong straps will securely hold your backpack in the optimum position so that it does not topple the trolleybag when stationery.Secret Pocket:Whether storing your mobile phone, passport or money wallet; this secret pocket found on the backside of the backpack is perfect for keeping your most important items inaccessible.Splash-Proof:Keep your glasses handy and out of danger, by hanging them from specially designed loops attached to the straps of your backpack.USB Passthrough:The useful USB passthrough, allowing you to charge your phone or device on the go by connecting a powerbank (not included) to the built-in consealed cable.