Cappa and I hit a new-to-us trail yesterday with a group from MetalCloak. When one of the guys fragged a rear driveshaft U-joint, out came the tools and spares. I thought this was neat.
If you've got a cat, you've probably bought kitty litter. Most of it comes in nice, heavy plastic buckets with snap-on lids. They come in different sizes and fit cleanly behind the rear seat of a Wrangler.
I personally never thought of using one of 'em to store trail spares or fluids, but it does make senses. Why spend a bunch of money on trail totes when these come free? And if you ever do wear it out, break it, or need another you'll have one free the next time you have to buy kitty litter.