Field Cleaning Kit...
Lots of different configurations out there from none 'I don't need to clean my piece' to 'half my ruck is cleaning equipment and solvents' when it comes to weapons cleaning equipment.
My kit is light, comprehensive, and easily stowed and will clean my tools when needed for a good bit of time without resupply. It takes care of 9mm/.45ACP (so I can take either, but not both) 5.56, and 12 Ga. I added a Gerber M4gery tool, some CLP, Springco MG lubricant, patches for both pistol and the 5.56, and a collapsible rod. Just over a pound, maybe pound and a half, altogether.
If circumstances force me to stay away from my normal cleaning 'laboratory,' I've got enough to keep me going for quite some time....maybe the rest of my life.