I carried 2 box calls in my vest for a long time but no longer do that because one of the box call sleaves is reserved strickly for my thermacell. I use it for Turkey season, Teal season, Bow season, etc... We have a summer wedding in Apalachicola Florida to attend and I will be bringing my Thermacell as it is on a huge marsh down from the bay. It works great and is fairly inexpensive to operate, buy the large refill pack at Wal-Mart and it will last a while.