I have 2 (so far) First, my fire starter. I carry the obligatory Bic lighter with me but I also have a magnesium rod thing that I bought at Wal-Mart years (or decades, by now) ago that I love to use. I save my dryer lint and pack it in sandwich bags and use that for firestarter with my magnesium rod. It works incredibly well and is super lightweight. Second, and this one I'm still working on, is a tree cover for my pack. I'm dipping my toes in the hammock camping waters (and loving it) but can't find a good way to stow my pack. So, I've got a piece of Tyvek and I'm tinkering with that to go over my pack. Basically, I've cut a hole in the Tyvek for the carry loop for my pack and have enough to go down the length of the pack and they lie over it. I've also got enough on either side of the back part to go around the pack like a hug. I use a tree strap with a carabiner and poke the carry strap of my pack through the hole in the Tyvek. Then, just wrap it up in the Tyvek and, if it rains or if the tree is nasty, the pack is *relatively* save. It's super durable and lightweight.
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