If you use cr123s, the orange Coghlans matchcase works really well, and you can silence it using the sheets of foam from a craft store, cutting 2 disks the diameter of the tube, one the diameter of the cap. Put 1 tube sized foam disk in the base of the tube, place 1cell in the case, put the second disk in between it and the second cell, and line the cap with the third foam disk. No movement (thus no noise), non-conducting, waterproof, and costs less than 3 bucks.