Used to make my "carry strap" out of a piece of tree limb (read:stick). About a quarter inch round and about half inch longer than my back pants pocket was wide. Sharpen both ends.
Run knife through squirrels back foot, push stick through hole.
Insert stick at a downward angle into back pocket until both ends are inside then twist until both ends of stick are wedged in edge of pocket. It will stay put until you pull it out for next squirrel. Usually got four squirrels to the stick.

Used that method for many years until Game and Fish made "open carry" of game illegal.