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I just ordered one of these and I'm gonna put the biggest bluest barrel onto it. It's all you could ever need out doors. It carries whatever you want to bring, and is a shelter if you sit down and pull your knees up (your boots might stick out a little bit but thats ok), or you could collect rainwater with it/make a nice juukoozee if you put it next to the fire and boil you.
All in all, barrel is best when a backpack