I was so excited when I found these.  I loved the idea of using storage containers rather than bags for every storage need so I bought several. After using them for several months, I have very mixed feelings about them.  They apparently are not good for long term storage.  I had them sealed and placed them in my pantry and not one of the three containers was still sealed.  It's probably a better choice to use the mason jar sealer or to place things in the bags for long term storage.  The other downside I have found is that there is water in the lids after they are washed.  So what are the upsides?  I have liked them for marinating.  That works well.  The containers wash up beautifully and do not scratch or change color, so that's a plus.  If I had it to do again, I don't think I would buy them because they take up a lot of room and do not stack well.  I would instead just go with the rolls and seal in bags or in mason jars.