These things are really tiny, I don't know that 2x mesh bags will work.You can get at least 2 sizes of mesh bags @ PetSmart for $1. + each.
Get two & double them up - that will hold in your Purigen nicely and you shouldn't lose any of the fine granules.
I used panty hose for awhile but it is a PITA because it gets very degraded when you recharge the purigen in bleach a couple of times. Then when you are rinsing the purigen off the panty hose breaks and you get all of your purigen down the drain. A lot more costly then using the bag since the bag will stand up to the bleach regen process many many times.Panty hose, dude. It works for all kinds of stuff. GFO (Granular Ferric Oxide), Carbon, and of course Purigen!
It works, my friend - I've been doing exactly that for 2 years.These things are really tiny, I don't know that 2x mesh bags will work.
I bought 250ml of purigen and the bag off amazon for a good price.
If your going to do that make sure you replace the fabric everytime you regen or else your free fix will end up costing you $5-$10-15 with Purigen going down the drain. I did it once then after that I bought the bag and haven't looked back.Go to the paint department and find the bags painters use to filter paint with.