If you have to leakproof an aero container, I did one of the early less streamlined methods. in my case, I had black plastic but a decent garbage bag will work.
it involves making an internal skirt that hangs down from the lid. Hot glue is made to stick plastic to plastic. Typical rubbermaid container plastic is very resistant to taking glue; but hot glue will do the job, although the finished product isn't bulletproof. The hot glue sticks to plastic sheet and garbage bags really, really well. Once it's on those, it's on for good.
What you do is cut the plastic so it'll go all the way around the periphery of the lid, inside the container, with enough overlap to ensure you can seal the ends where they start and end.
You just take the plastic, which also has to be long enough to make it down to the water (which forms the bottom seal) and glue it to the lid, so that when it's all over, there's a continuous skirt all the way around.
The method I use, blows into the root zone with a fan, and the leaking was real substantial. I used silicone hand made gaskets, I used little flaps of plastic, nothing worked. But, I have to say that just as the original author of (I can NOT remember who or where) said it would, the skirt fixed ALL leaking like a champ.
It's not pretty. It's not the easiest method to manage once you lift the lid, but I just want to verify, it does work. And it doesn't really cost much at all to make one. It also doesn't take any real calibration, or precision building.
Just to let you guys know.