I purchased one set of these containers a few months ago, and after learning how to fasten the tops without collapsing the container (practice this when they're empty!) I have really liked them, and bought two more sets. I'm trying to get away from using plastics as much as possible, and so far these are working for me. Stacked flat each set takes about as much verticals space as if I nest them to store, but now that I have three sets I will probably fold them down and stack them all together—using vertical space instead of horizontal. These are much easier to use and clean than the zip-top silicone bags I have.