You could make pods out of PVC, but you'd have to build your own lids. Not to mention that the only size you could use would be 2" or 1", and the 2" is too big to fit into standard packs, and the 1" is too small. By the time you sew yourself a new pack, fit your own custom lids on them, buy the PVC and spend your valuable time building them, it's well worth it to just spend a couple bucks on a pod. I'm a real do it yourself kinda guy, but making your own pods from PVC seems quite a waste of time and resources.