I’m new stacking this year sbd have tried most of the 3-4 big brand “Air-Tites” and the Guard House cap likes seem to fit best vs other competitors, and the selection by size is really deep…best of all as I stack / Collect some odd size silver pieces I can buy the 1 or 2 capsules from Guardhouse vs minimum pack of 10 from others folks. Not a cost thing but a logistics and convenience thing to me.