We've all found them, geocaches that use a peanut butter jar as the container. While they are a great size they are not waterproof, until now. We have sourced an 89mm gasket that works perfectly for the 1kg peanut butter containers. Unlike an o-ring the gasket will not shift out of place as the container lid is tightened.
This product includes three gaskets.
TIP: Clean the jar very well after use. Use a degreaser to clean the inside. Any peanut butter residue will attract animals.