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I just bought those tubes on amazon, 20 for $5..shipping cost as much as the product. I made a few "evil" containers using epoxy to glue items to the lid. I can't wait to hide them! I would attach a picture if I knew how... I'm new lol
Here is a picture of a few of the caches I made with these tubes- buttons, coins, bottle caps. anything goes. Now i just need to find a good place for a hide!