I make my own lure holders from a 35mm film canister (cleaned by running through a dishwasher cycle with light detergent). I take a 1/8" drill bit and perferate the canister about every 1/2" or so all the way around the canister, top to bottom, but through the canister's sides only, not the bottom area. Then I take a 10" length of stiff wire and make a tiny loop in one end only. This loop acts as a stop. Take the other end of the wire (usually slightly sharp from the wire cutters) and push this end through the canister cap first and then out the bottom of the canister. To open the lid now, you have to work the wire back up out of the canister a bit. Put a couple of dry, clean cotton balls inside the canister and it is ready to be loaded at the set location. I make a bunch of these up ahead of time during the off-season.
When making a set, just slide the wire up a bit, open the cap, and apply lure or urine, or even bait, to the cotton balls inside the holder. snap the cap back on and pull the wire down through it snugly. The extra wire coming out the bottom of the container can be worked into the ground at the set...pushed in with help of a pair of pliers, or you can also use this wire end to wrap around a clump of grass, post set "post" material, or can even use this holder for call lure and wire it off to an overhead or nearby branch or fence. The lure holder helps keep the rain off of your lure, the perferations help the air currents flow through the container across the lure inside. Reluring if needed is a snap.
After a catch, sometimes the holders are chewed up too badly, but most of the time they get worked off to the side and are reusable for remakes. The wire support/holder also helps keep the cotton ball from "running off" when a coon tries to steal the holder without getting caught.
Anyway, just thought I would pass this along. I can't take credit for the concept...I saw Rich Kaspar of Crete, NE use them once in a trapping demo and I remembered how many rolls of film I usually go through in the off-season, and the concept seemed to make sense to me. I've used them for many seasons now and really like them. I use them at castor mound sets also by putting them on the backside of the mound, and have had very good success on beaver with them. Black film containers seem to generally match the black muck from our local stream/lake bottoms here. I have also used the white and clear film containers too and have not seen much difference in them compared to the black. I do think the black absorbs a bit of sunlight which may help a little during day hours and freezing temps, but probably not a factor after hours one bit.
Jim