I took a Boyt Over/Under bag, cut off the top box holder and use just the big empties pouch for a box+ of shells, coupled with separate hull hamper. This way I don't count my shells and can hold 50+ shells for doubles/games.
Mine's flimsy leather, a shell box sized pouch, and a net bag that will handle 100 hulls (though it rarely gets beyond 50 when shooting doubles) under the pouch. Snap straps to hang from belt. Unknown name or brand and kinda fear it just might wear out before me. Or, maybe not!.....Bob Dodd