The bladder membrane is made from natural rubber. The membrane is approximately 3/16" thick. The 40L bladder measures 17.5" long. The outside diameter is 6.5". The top and bottom holes are 2.75" and 2.25" in diameter. The 80L bladder measures 21.75" long. The outside diameter is 7.75". The top and bottom holes are 3.75" and 3.9" in diameter.
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