3 Mini Protank 2's in rotation at all times. When I empty, I disassemble, wash with water, dry, reassemble and refill. Two tanks get my all day vape (Wowboy) and 1 gets my sweet vape (green apple)
I have 2 replacement glass inserts in case the glass on one of the Mini 2's gets busted. I also have two Mini Protank 1's (non replaceable glass) that I retired to use as backups to the backup glass. I also use one of these to sample other juices occassionally
22 heads currently in spares. I also dry burn the coils and replace the flavor wicks when I notice taste quality decreasing. Not great at recoiling so I don't completely rebuild. Dry burning and replacing the flavor wick is a nice compromise for me.