When you're not using this feature-stacked bag, pack it down to almost nothing. It's great for stuffing in your suitcase for us as a day bag abroad. It expands to hold up to 16 liters of gear, made from ultra durable waterproof 30D Cordura ripstop nylon along with a waterproof coating. Internally sealed seams keep your stuff dry while the front organization pockets keep it all in order. The adjustable shoulder straps allow for even weight distribution while the zippered main compartment allows for easy access to your essentials.