Let’s talk for a second about NSN: 8465-01-525-0589, Molle II Hand Grenade Pouch, IR Reflective.
These bad boys are about the size of two packs of cigarettes and are made, as you would guess, to swallow one frag-type grenade. Thus:
They also are dirt cheap (get surplus, you can find them for about $3. I inherited several of these from a friend who just got out and was getting rid of most of his stuff), reliable, have easy Molle snap attachments on the rear to fit on any sized belt, bag or carrier; and of course a snap front as well as a drain hole in the bottom. While I (generally) don’t carry around grenades or flash-bangs anymore, the pouches are useful in lots of other capacities such as to carry an IFAK (it’s like a take-out Chinese food container, you can really stuff a lot in there, just be sure to bag it to keep the wet out) or compass while hiking or camping.
I also tend to need some extra M1 enblocs from time to time as I use a CMP special grade (old WRA receiver, misc GI parts, new Criterion barrel in a Boyd’s hackberry stock) for deer/hog hunting and a 1944-vintage 3.1-serial field grade Springer for range antics.
I find that one pouch holds three enbloc clips perfectly for an all-up weight of 26oz for said ammo, clips and pouch:
Two pouches give you 48 rounds at the ready, four is 96 rounds for 6.5-pounds of weight on the rigger’s belt going into an unconventional 3-gun match. The more you know…