Can't give you any description of game bags in early America, but there is documentation for their use.
The Pennsylvania Gazette
February 7, 1760
This is to give NOTICE, THAT JOHN BEALS, net maker, from London, makes all sorts of nets, as seins,”¦. partridge nets, pigeon nets, hoop nets,
fowling bags , and all other sorts of nets,
The Pennsylvania Gazette
June 27, 1771
”¦..various sorts of cork screws; powder flasks and shot bags; silver and steel cock spurs or gaffs;
shoulder bags for dead game; green goggles to preserve the eyes;
The Pennsylvania Gazette
October 24, 1771
JUST IMPORTED, and to be sold by NICHOLAS BROOKS,”¦. new fashioned shot pouches , leather powder flasks,
shoulder bags for dead game, ladies earrings,
From the paintings of Francisco Goya, Spain, in the 1770s:
And this is the one I made for myself.
Spence