I "recycle" various tobacco tins; the tried and true "PSK-sized" tin, for obvious uses, and the round "cans" with press-in lids for making char cloth. I just found a little 50 gr. tin, half the size of the one famous for PSK use, and made a nice little fire kit from it. Didn't even wait to finish the tobacco from that one.

The tobacco went into a small, salvaged, hevy-duty zip lock bag resistors came in. Hopefully the resistors were not washed in something that causes cancer.:foot:
Prescription bottles, of course. With what they cost, may as well get some further use from them.
Rubber bands from broccoli. Always call dibs on those before we leave the store.
Steel ("tin") cans for a hobo stove and billy. I found that the Gia Russa chicken stock can is slightly larger in diameter than the standard 4" can - so, the hope is that I can make a nestable kit of them - stove from the chicken stock can and billy from a standard 4" can.
35mm film canisters, which are getting tough to find. I remember the day that they were like plastic shopping bags - you didn't know what to do with all of them.
Various zip-lock bags in which things come. I am always scrounging those from work. I have scored some nice, heavy-duty ones of peculiar sizes that way.
"Snuff" cans make nice little fire kits or tinder boxes but Cope' cans suck for that so I only get the plastic ones when no one has fresh Cope'.
The sacks my Benchmades came in (like I am going to leave a working knife in a cute little sack, HAH!) are home to my change and another for 12' of paracord, a tube of Carmex (Chapstick melts and runs) and a spare AAA for my ARC+P.
Percussion Cap tins. Dixie Gunworks had a "house-brand" they imported from Italy for years that was the best cap I have ever used, especially in revolvers, but the tins were of excellent quality too. I just found an empty one today and plan on stuffing it with char cloth and figuring out how to attach it to my new Mtnfolk neck sheath, which is a super sweet rig, by the way.:thumbup:
OH! Old jeans, dish towels (not terry cloth) and cloth baby diapers for char cloth. Just about forgot that one.
Old bore cleaning rods for pins in handles of knives.
Super Glue tube for single AAA battery storage, machine tool cutter slip tubes for CR123As.
A friend is giving me a Crown Royal sack as a "trinket organizer" for inside my bag, after he saw me getting change out of my Benchmade sack. Incidentally, this has started a rumor that I had my sack out playing with it by the coffee machine. Not a lie but not the conclusion to which most people first jump.
Pencil lead containers for needle cases. The ones from when pencils were used for drafting are better than the ones available today. They were round and just longer than duct tape is wide, so a 36" strip of duct tape is about 5/8" diameter when wrapped on one of these. The lids were more secure and water-proof.
Typewriter erasers for cleaning rust spots off of gear and cleaning battery contacts in lights. Now, that one is a stretch. I don't know if they even make those any more.
I would have to dump my bag for more ideas and am not inclined to do that this moment.
Good thread.:thumbup::thumbup: