Lid very hard to get off!
923546
Lid is very hard to get off for a child or an adult. Doesn't keep food as warm as it should.
3226972
I ordered two of these and the lids come off easily.  I have to tape the lid shut when my chinchillas are in the exercise balls to make sure they don't get out.
4075509
The lid is super gross -- incredibly hard to clean. I have soaked in baking soda and bought a brush to clean it consistently. It takes too much time to do this after every single use -- but it isn't usable if you don't do it. I've permanently switched to an insulated Klean Kanteen mug and will never turn back. It's got a smooth lid that actually seals.
4331441
Horrible, won't stop after can is opened had to remove the battery! Once it was stopped I put the battery back in place, it started again and won't release the lid. I cut myself trying and the lid is still stuck.
1471814
The lids are very hard to get off and on, but the product is sturdy enough for my purpose.
4433880
I like how it has a lid seal under the screw on lid but the grooves are so messed up its so hard to get the lid on that it literally makes me mad.
878737
I couldn't get the lid off!  Can't return it because I just opened it and I couldn't get the lid to move - so I don't know if this works or not! Bummer.
3853850
Lids are very hard to place on top of corning ware and once you are able to get them on, they are very hard to remove. I do not use them at all since they are so difficult to use
2481936
The lid of this container is ridiculous.  It is hard to unsnap and hard to snap back on.  I have other airtight storage containers that are not a pain in the but.
3751321
Lid will not stay on, even after using a rubber mallet.
4058125
Difficult to remove lid, had to work hard at it.  Would take guest too long to remove it, funs over by then...
2340604
As others have commented, you have to push down on the lid while squeezing up on the red handle to open the lid. This always took a little effort, but I was able to do it on the first or second try for the first 4 months. Then last week, I tried to open it and couldn't. I struggled for 20 minutes to open it, with no luck. I was literally sweating from the effort. I asked my husband for help, and after about 10 more minutes of effort, he managed to get it to release and open.  The good news is that I was able to access my documents, but the bad news is that I'm afraid to trust the thing anymore, because I might not be able to get into it again.  btw I've never locked it - only closed the lid. Nothing changed between the last two times I opened it, that would explain the latch shifting or jamming the way that it apparently did - I opened it Thursday and had no problem, then Friday it would not budge. Crap.
3960111
Taking the lid off is dangerous too unless you have oven mits on and you can't poor with the lid on. Poor design.
1715566
The hard shell was SO hard to get off, I had to pry it open with pliers, not worth the money!
2463197
We hate this lid. I wanted to return it but we misplaced the bottle in our van and just found it and missed the return window apparently (Forza sports was the seller). Its almost impossible for me to get the lid open and it IS impossible for my 3.5 year old to open it. The button is extremely hard to push and once its open, its impossible to relatch.

DO NOT buy this lid. I wanted it to replace my daughters hard spout nalgene sippy lids. We will just stick with those. She only uses them for packed lunches anyway and drinks out of a regular cup the rest of the time.
2983617
Great size containers... but, the lids are WAY TO HARD TO GET OFF!!! They snap ON easy enough, but they do not snap OFF without everything ending up all over the counter and floor!
2712329
I really wanted to love these container as I have invested in nice selection of them.  After owning them for a year now, I can honestly say I'm not sure I would buy any more.  I read the customer reviews that stated the lids are difficult to get on and off, but several brands had this problem so I went ahead and purchased these.  Today I had my fill!! The lids on over half of the containers are so difficult to use it makes me hesitate to use them at all.  I'm fed up.  Please be well aware that the lids are SUCH an issue.  I am strong, but I call Uncle.