With a capacity of 25 litres this Vango Track 25 Daysack is a great all round rucksack ideal for commuting going to the gym walking & everyday use The Track 25 has an Air Force back system shaped adjustable harness mesh on the adjustable straps & an adjustable sternum strap so that you can personalise the fit for the optimum level of comfort while carrying This backpack has plenty of versatile storage options including a large main zipped compartment with a hydration pocket inside a medium sized front pocket with two organisation pockets inside a smaller pocket on the very front it also has two side pockets & daisy chain to attach extra accessories making this an incredibly useful bag