Donut Case for Chainsaw Chains

This may work for other things, but i wanted a way to put multiple chainsaw chains in my backpack without making a tangled mess or hacking up my lunch. This can be clipped to the outside of the pack too.
Intended to hold narrow kerf 18" chains for a little DeWalt 60V chainsaw. (Nice saw for invasive brush and vines, but the batteries are expensive!) The taller case is for thicker/longer chains.