The flip straw lid provides effortless access, while the no spill design keeps your drink secure on the go. Replace your 40 oz tumbler with stanley's quencher h2.o flowstate™ lid Mine only leaks when knocked over but i did purchase a spill proof kit from amazon and works great
This Leak-Proof Stanley Cup Tumbler Is On Sale At Amazon | HuffPost Life
It was a must with having 3 dogs and a toddler whom knock my cup over
I do prefer the stanley because it is very duarable, don't have to fill as much, and my water always stays cold.
Stanley’s insulated stainless steel tumblers are praised for their quality and temperature regulation
