Mine has never leaked and I dont even close the airflow. Regardless of how full it was to start with. Where is yours leaking from?
I just got one about a month ago, and loved it at first. The leaking thing while filling has turned me off a bit. I know that I could fill it when it's empty, but sometimes that's easier said than done. I like the ability to top it off if I'm heading out for the day, and this is truly a hassle. Have you found a way to fill without, or even minimal leaking? Other than that I love the tank. I have always used Aspire tanks until now. Unfortunately this one made me go purchase a different brand.