Carrying multiple boxes of .22 ammo while squirrel hunting was something I didn't care for. I wanted a good number of rounds with me, but hated the hard rectangular boxes in my pockets. Enter the British made leather pouch.
I ordered two pouches and use one to carry ammo. It is a little bigger than a tennis ball, and holds about 3 boxes of loose ammo. Much easier to carry and access than the rattling and fumble-prone ammo boxes.
The other pouch carries everything that I would put in a small metal survival container, minus the rattle and corners. And, being a bag, you can always stuff in one more thing.
The build and leather type is critical, as there are plenty of leather pouches out there that I find worthless. The flat, split cowhide type with a drawstring looped through punched holes doesn't cut it.
The bag should be:
-top grain glove leather
-stand up when empty or full
-have a sewn-in channel for the lanyard
-fit in the palm of your hand
Optional, a sewn in hanging loop comes in handy.
Here's something similar I could find quickly on eBay, but has punched lanyard holes, and is a little taller than mine. Under $6.