Osprey Ultralight Dry Stuff Pack 20 Osprey’s Ultralight Dry Stuff Pack 20 is a very handy item that can be used to carry up to 20 litres of luggage but packs down very small when not needed. Its waterproof construction and roll-top closure mean that the contents will be well protected, or that wet contents such as swimming kit can be kept separate from other dry gear. There are shoulder straps and an adjustable sternum strap for a comfortable carry and there are side stretch pockets to quickly stash items in.