Sand Pit Woes 4 CrazyOldCatMan
So, you never heard of building a sandpit with a lid?
Tsk!
Recommended purchase: the Step 2 Crabbie Sandbox.
Had one for best part of a decade. Weighed lid with a housebrick. Cat-free the entire time. Eventually it succombed to a decade outside in New York weather. UV did for the plastic.
Crabbie Sandbox is the best use of kid play $$ I ever made. Just add sand and crabby kid.