I use MTM, Franklin, Berry's, Cabela's, etc.
100 round storage/handloading. 50 round for the field/range.
For large bore handgun - P64-50...64 rounds.
Bags, boxes, pockets, pouches, saddle bags, pack pockets and clothing pockets, ammo belts.
Old M19A1 and M2A1 cans.
PA-108 cans.