I have really enjoyed reading the posts, thought I'd put my 2 cents in. I always have an 18 gauge sterile needle in all of my kits. It's great for many uses and doesn't take up much space.Ask your friendly medical or vet professional.
I found a saw made by Allway tools, it's small, lightweight and has 2 blades. Runs about $3 or $4. This is the FS2 model and can be seen on their site www.allwytools.com It's too big for a small tin sized kit, but will go anywhere else.