If your flashlight takes 2 CR123 cells you could reverse the second cell so that the -ve base terminals are back to back, then store the cells internally in the flashlight. CR123 cells normally have plastic covering the outside circumference of the -ve base. Storing them this way will isolate each cell inside the flashlight making it virtually impossible for accidental turn on. If using a single CR123 cell flashlight/LASER then it probably would be a good idea not to store a cell inside the flashlight/LASER as it could accidentally be turned on.