ThermaCELL BP-24 refill tiles for Backpacker device The package contains 6 (24 hours) refill tiles(without gas cartridge!!) for thermacell devices. Recharge unit package primarily used for the Backpacker device. ThermaCELL BP-48 refill tiles for Backpacker device The package contains 12 pcs (48 hours) refill tiles (without gas cartridge!!) for thermacell devices. Recharge unit package primarily used for the Backpacker device.