weatherseal tape, available at home depot or lowes

put it along the top of the container where the lid comes in contact with it

do NOT stretch the tap, it will snap back

when you put the lid on the container, i am assuming it locks just a little....the pressure will prevent leakage

Is there any reason you couldn't put a couple bricks or rocks on top to hold the lid down tight?

I'd use rubbermaid containers, they are considered "food safe" - Im not sure about the sterelite ones.

Secondly, I'd suggest using "closed cell foam" tape - this is mentioned in the how-to-hydroponics book and has been great in all of my systems, including my homemade cloning box which has very high pressure in a small area...

good luck

mine just leaked, so i put it in a just slightly larger tote. put holes in the sides of the original one so that whatever leaked over the sides, made its way back into the original reservoir

As far as bricks, that might work for a bit if you have even pressure all around. I tried spring clamps and found that didn't work either. Again, uneven pressure can seal one spot while opening another. I developed a very small drip in one area even after all the changes and just put a small container under it. At the end of the day I just dumped that back into the reservoir.

Also, a note on the closed cell foam tape. . . which is weatherseal. It isn't always the top that starts to leak. That adhesive isn't waterproof. It will stop sticking and leak from underneath after awhile. No matter as long as you don't mess with the lid much. Even pressure will keep it in place just fine.

Well the challenge is to work it so that you seal the lid without greatly sacrificing the ability to remove it, since you want to be able to get into it whenever.

Another thing you might want to try is getting several bungee cords, setting the whole thing on top of them with several laid out from side to side and one or two laid out long ways, so that when the bin is on top of them they're trapped underneath and you have hooks pretty evenly spaced around the sides.

Then you can pull the hooks upward and catch them over the top of the lid (make sure you do both ends of each strap at the same time). The beauty here is that you can slide them back and forth to even out the pressure.