I was pretty happy with these containers. Upon filling them, one had a very slow leak from the bottom. It wasn't a huge deal � I'd guess that it would take a full day or two days to empty the container at the rate it was draining, but still.Rather than go to the hassle of contacting the seller and doing an exchange (since I was shortly leaving on an outing and wanted to use these containers), I was able to track down the source of the drip and threw a thin layer of silicone over it. That seems to have has taken care of the problem, and it's held up fine for a little over two weeks.At the end of the day, I'm not too put off by it. Even the most rugged equipment is going to need maintenance from time to time, so if a few drops of silicone are all it takes to make the thing perfectly functional then I'm happy.