Timerover51
SOC-14 5K
Exactly - and prior to metallic cartridges, keeping moisture away from the paper cartridges and the powder therein (or just loose powder) is critical for the powder to function correctly - thus the preference for leather for cartridge boxes and powder pouches.
Leather was also discovered to corrode the early brass metallic cartridges when used for cartridge loops. It did work very well for cartridge boxes for the muzzle-loading weapons, and the early breech-loading Sharps that used a combustible paper cartridge.