I have bought these for the purpose of stacking in hopes to eliminate the problem I have had with the ones you can purchase on the spot at most stores . (Sterilite, ,Hefty) all of these come in different strength grades of course and the price increases considerably for the heavier duty ones, if, you can find them in stores. However even some of those with the better designed tops for stacking purposes, when storing them in garages or attics the heat will eventually cause the tops to cave in when stacking more than 3, thus not useful when trying to save space. I researched several sites and read many many reviews weeding out the fake reviews (how annoying is that!) and short of buying military grade or lockers so heavy you can’t lift them to stack , or breaking my budget, these are the best I found. In the Med size close to the other brand Im changing out they are not as long, but you get some space back in the height of these. The coolest part is they arrive in one box all stacked together. I could not believe that 3 arrived in one box! The way the lids fold to stack each one inside the other is so compact and the lids permanently attached so no more loosing them. They stack securely with a fantastic deep top edge design so once they are stacked you can’t knock the top one off. So far I love these containers. They appear to be more durable than my old ones, like the body of the container not just the lid. The long term durability, well only time will tell. I Plan to buy the bottom rolling cart to move them about effortlessly as I use them for my heavier breakable holiday decorations, fun halloween dishes and even expensive holiday themed China . So far so good. I’m 15 containers down, about 30 to go in my conversion to these. I’ll update when the project is done. THRILLED AND RECOMMEND