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Message:: [QUOTE="John Burgess, post: 4889166, member: 105098"]PVC pipe in 1", 2" 3" even 4" diameter isn't that expensive. HOWEVER, it's gets really expensive when you are looking for 10" -12"+ diameter, and the end caps. the larger the diameter the more expensive it gets. So depends on how big you want this time capsule, I would also suggest PVC cementing one end cap, and on the other using PTFE tape so you can eventually pry off the cap again without having to cut your way into it. I don't recommend just putting the end caps on if it's going to be in the ground a while, even a little moisture leak inside and whatever was put in there will be messed up. I would say for cost, a hermetic glass storage jar with glass lid a rubber seal and metal clp will do just fine, and wrap it in duct tape to protect the metal clip that holds it shut, or dip the entire top in melted wax a couple times between cooling and drying if you prefer that will protect the metal from corrosion and hold it together. you can likely find a wide mouth version in a gallon size for under $20. if it's something small, the small diameter PVC is likely the way to go, you can find it all in the home improvement store in the lawn or irrigation department, even threaded end caps and threaded couplers, and a roll of PTFE tape. if it's larger items the jar might be the way to go. really depends on how much they want to bury in the time capsule, how much volume you need..[/QUOTE]