Just a note about a little project I've been working on. I got two 8ft peices of 6 inch PVC pipe cut them into 4ft sections along with 4 solid end caps and 4 end caps with a threaded plug. I glued the the caps on both ends and removed the threaded plug and taped the end. I then bought the spray on bed liner gave each tube a good heavy coat and let dry. I then place some paper towels in one of the tubes and put a film of blue glue (used for gasket on vaule pan covers) placed the threaded plug in let it set and dry for an hour. I tied a brick to the bottom of it and placed it into the lake for three day's everything was still dry. placed some spunge in it with a glass coffee cup in the center and dropped it about 20ft onto pavement. tube bounced didnt break or crack and the coffee cup was still in one peice. This might be a bit of an over kill for storage but after I was done testing it. I feel better about under ground storage.