Green bullet box for holding projectiles is used for .223 reloaded ammo, it holds 75 rounds.
My old boxer briefs (washed first of course) cut into rags and patches, nothing is as soft as worn down cotton boxer briefs.
Ice cream containers for levels of brass prep (cleaned, trimmed, once fired, twice fired, etc.).
Grand Theft Auto lockbox that came as a special edition for loose .22LR.
.22LR bulk boxes for reloaded .223, most hold 75 rounds.
I used to be a medical equipment repairman, I got an old oxygen concentrator carrying case for free. This box is huge, it will hold 6000 rounds mixed between centerfire handgun and rifle ammo. It's hard plastic, rubber sealed, has a stainless steel piano hinge, and two locks.
MAC Tools bag that I got for free when I got some new ratchets is now a range bag.
Mosin ammo tin that holds small parts, extra handgun grips, and extra cleaning brushes.
Gym bag shoulder strap that is old school camo that has been remade into a sling.
Old large pill bottles for ear plugs.
Metal coat hanger coated with rubber and bent to fit into the door reinforcement panel on my safe to hold my bullpup 10/22.
10"x10"x8" chocolate tin for holding oils, copper solvent, and locktite.
Wood blocks cut to hold barrels.
Galvanized steel pipe, elbows, and T fittings for a AR500 steel target stand. I know I have more but trying to remember everything is hard. Besides, I don't want to go on all night.