Picked up two of these recently and first couple uses they appeared to work fantastic. Last weekend I filled one up, sealed and popped it into my back car seat. Drove to mates place and upon removing from car realised it was leaking out of the hole where the spring wound ring enters the lid. Re-seated and wiped the seal, tried again and it leaks slightly again. Anyone else transported them on their side and had a similar issue? Haven't had more time to investigate further but thought I'd see if any here have experienced a similar issue?