Selling these on Ebay for $22.59 each. I bought a bunch but don't need them all. Using one to carry my 700 foot rope through Ellisons Cave. You can load too much stuff to carry. Lots of room and durable.
http://www.ebay.com/itm/141322340229?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649