2 ponchos do a fine job of keeping dry

serving as a raft, tent, basis for ghillie suit (with hammock attached over it) and so on. You have to tie it down, while walking in wet brush, or your legs will still get soaked, but there's little REASON to move much, in such conditions, really. Wrap one parka around your backpack, and it will not only stay dry, but it will FLOAT, too. You can push it ahead of you while you swim, ya see. The pull string for the hood, can be used to "tie off" the hood area, for when you need a "non-leak" stretch of material. U CAN'T AFFORD to waste the wt and bulk of items that are single-use, in a BOB bag, like sleeping bags, tents, rain-gear, etc.