The Stryker XL expands from the original Stryker, the XL has more internal capacity as well as a longer sling to hold larger loads. The dual water bottle pockets are sized to hold 32oz Nalgene bottles. Bladder compatible, the dual upper hose ports make staying hydrated easy. An extra 500 cubic inches to the main compartment over the original Stryker will swallow up the extra layers of insulation you have been asking for. The sling has been lengthened to accommodate larger items, get tree stands lower while you go through brush and still has the pleat to centralize the load. Pals webbing lines the back of the pack and inner sleeve so you can load out your pockets the way you want them. The front panel also has a quick access zippered pocket with key hook. Compression strap tabs front and back will help you compress the load without crushing the contents of the pack. Comes with 8 K-clip compression straps and Autolock buckles. Our Chamber pocket hangs in its usual removable spot on the inside top of the bag.