Not common stuff, and thought about showing off. Small lecture.
m/22 cartridge case carriers, period correct name (patruunalaukkujen kannatinhihna, in finnish). Used by Cavalry and bicycle troops, later Jaeger troops.
Infantry had ww1 german style tornister, which had cartridge carriers of its own. Mounted troops didn't carry backpack so Y-carriers were invented.
Two of them has Int.28 stamp (made in 1928). Only one of them has correct backhook leatherpiece.