These ball pouches are produced using the same methods as my belt pouches. The deer antler stoppers are made from sheds I pick up here on the farm in MS. Both sizes will accommodate .54 cal and under round balls. Not sure of capacity as the only round balls I have are .36 but should easily hold a days worth on the range. Also both are small enough to fit in top pocket of a shirt. Small (single lanyard hole) $30. Large $35. Plus shipping. I’ve found most people prefer to make their own lanyards. Or add $5 for a simple leather lanyard.
Edited to add
The large will hold these quantities:
.440 40
.490 21
.530 16