Described herein are {TAIL ~ end caps} which, as well as being connectible to the ends of the canisters, have {HEAD ~ recesses} so that the end caps, having been removed from the canisters, can do double duty engaged between the sides of the canisters to support and space the canisters in a stack formation 
Described herein are { TAIL ~ end caps } which , as well as being connectible to the ends of the canisters , have { HEAD ~ recesses } so that the end caps , having been removed from the canisters , can do double duty engaged between the sides of the canisters to support and space the canisters in a stack formation
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH