TNF Surge Backpack it's made from durable recycled nylon ripstop so it doesn't need to be handled with care. Thanks to moulded shoulder straps, a padded back panel, and its FlexVentâ„¢ suspension system, it's comfortable to carry - even when fully loaded. The 31-litre volume is made up of a large main compartment, a front compartment with a padded tablet sleeve and zipped pockets, and a laptop sleeve.