A few years ago when I first bought a few kids konserve and u-konserve containers (round, square and rectangles) I would've given them 5 stars. Not long after, almost all the lids started to crack, break, fall apart , the clear ones are the worst (I ONLY washed them by hand, NEVER in the dishwasher)!!
Some of them are not even leakproof, I had a few 'surprises' in my lunch bag (also u konserve). Replacements lids are only available on the u konserve US website ... If not 'on sale' they are really expensive and maybe they used to be better but for me they are a big dissapointment. I won't recommend them ever again.