Handy size, practical features - ideal for travel and everyday use. The TRT 18 is a small day pack with a 14" laptop compartment and is part of our heavy-duty TRT backpack seriesTRT stands for 'tough, rough, technical' - the backpack series for the tech-savvy user who wants a product that's built to last. The front of the pack is equipped with multiple gear loops. You can use the loops to carry additional items of kit or fasten your LED light to them when you're cycling home after dark. The two hooks on the back of the TRT 18 allow you to attach it to one of the larger packs in the TRT series when you're travelling.