These carriers are designed to hold the Modular Sleeping System bags that I sell here. They also can be used to carry any other size bags or equipment. They attach to the outside of your pack to save you valuable space. They are waterproof with a cinch enclosure to keep the elements out. Use them on your motorcycle, canoe, atv ect.. They also make a nice butt pack. Send me your zip for shipping. They are very light so shipping should be cheap. Again, They are brand new.