Review (5/5): Travel essentials items（complete）
I have tested these near two months, traveling to 8 countries and boarding on about 8-10 flights (possibly more) the shortest flight a half hour and the longest 32. They did not leak or open while in my backpack which was a fear especially with the pressure. I followed the advice of others and made sure to take some of the excess air out before packing them away. I personally also put them in ziplock pouch not only because of TSA but for my personal sanity just in case they leaked (but they didn't!). The self-sealing valve worked great when taking my product out for use. The material has a bit of grip to it which is helpful.