I have to do a lot of repairs in the field as well. The wire idea works to keep them together, but is a pain to get to the one you need. I settled on a soft type pencil case. The ones that fit in binders. I have a cloth one with a zipper. It was $1 during school shopping season. It's not optimal, but they all stay together and I keep a ratchet and extensions in there too. I always have my crunch in me as well for when I have to hold the other side of the bolt. Good luck, let me know what you come up with