willow water containers

As a general rule it is always usefull to stand your water containers up if they dont seal correctly.

Having said that, if they are leaking, you might just need to replace the rubber seal in the cap.

I had the same problem. It was due to the top surface of the opening ( the mating surface to the cap seal) being uneven. I solved it by filing the surface smooth. I had first tried a new seal but that was not successful. Hope this helps