Is it aways necessary to keep your vaping device upright so it does not leak ? I am using an Aspire Cleito and it occasionally leaks a small quantity of juice which comes out the air vents at the bottom. I can live with this but I would like to be able to put it in my pocket without worrying it would leak a lot. If some can be kept on their side or even upside down can anyone recommend a bombproof leak proof tank please ?