I have the Dragonfly and PU18. If I could have just one, it would be the Dragonfly. I use the PU18 as a day pack, but the Dragonfly is a serious load carrier. IMHO, it'll carry more than you can comfortably carry. Love my PU, tho. Carried out my little coues this year, slung thru the meat shelf. It is a great design. I use my PU for day pack, but have the Dragonfly in the truck/UTV to switch out when I am in haul mode. I have packed out 4 elk with the Dragonfly. I guesstimate I have close to 50 miles with meat in it, now. All day comfort.