I tried covering both airholes while filling it, putting cap back on slightly, turning it upside down then screwing it all the way in but it still leaked. I know this was a method people were using on the kayfun 3.1 however I was wondering if there was another method. It could be that I didnt follow the procedures smoothly, especially the screwing of the top cap back while its upside down. If I dont get the threads aligned right away it leads to me having to unscrew it and screw it on again while its upside down which can lead to the juice escaping. Very annoying way to refill the juice, any other methods from the top without it leaking?