I bought one of these a hundred years ago from who knows where and have used it for all kinds of things. It's been useful enough that I bought this product to have a second one around. It is waaaay flimsier than the old one. You definitely have to be careful not to bend it while assembling, and I'm not sure how much weight it could hold.However, I use it to dry and store sports gear and it works perfectly. So overall, no major complaints.I bought two sets of these and some zip ties - like many, I wanted them for a C&C cage for our guinea pig. I figured, two sets of storage cubes would still be cheaper than a pair of Midwest cages shoved together, and in our circumstances, also provide more space (we aren't putting a "grid lid" on it) - win all around.(Feel free to skip this paragraph - it's backstory.) We received Miss Piggy from a neighbor in a store-bought cage, and after doing a bit of research, found out how insufficient those are (space-wise) for a guinea pig! Our first go-to, since money was an issue, was to pick up a hard-set kiddie pool, put a thin layer of just-in-case bedding in it, and some cardboard boxes with holes cut so she could at least have a play area. That worked fine, but we couldn't leave her in there ALL the time, and our attempts to add a "loft" to the interior of her cage were utterly unsatisfactory. Even the crinkle tube we rigged to the top of the cage became problematic after a couple weeks; while she could make the leap to get into it like a champ, the noise of that at all hours in an otherwise-silent house had all three of my boys getting up to investigate! We had to look for other options and discovered C&C pictures that piqued our interest... and now you're up to speed.Well, our C&C cage is missing one of the C's. We happen to be fortunate in that one of the boys' beds is a bunk that used to have a slide, with nothing but play area underneath. That space didn't get much use until we cleared out the toys and installed the cage using these cubes under there! We've got a thin sheet of plastic under the fleece (thank you, Internet, for explaining that we don't actually have to keep buying messy bedding!), and since that's on the floor, we don't need the corrugated plastic at this point. Miss Piggy started with a plain rectangular 3x5 area. I realized today that we had enough leftover connectors and grid squares to add on a 1x2 "kitchen" area that sticks out from under the bunk bed, nearest to the wall under a window, which similarly was not getting much use. Not to be outdone, my boys decided that it would "get her some exercise" if we added a few "walls" inside the 3x5 block, so now it looks sort of like a maze with some holey cardboard boxes strewn along the way so she can hide as she goes. Pellet food and water go in the "kitchen," farthest from her salt wheel and hay tray. For a few minutes she just sat there when we put her in. Before long, those wonderful wheeks started and she popcorned like crazy and ventured out of the kitchen in full explorer mode!I know that sometime in the future, we're going to want to make additions and alterations in order to shift some of that horizontal sprawl upwards. For now, though, even without the corrugated plastic, I feel like we have given our baby girl a good outcome. She loves all the space to run around, plus we can easily shift the cage contents to keep her interested in exploring. I love that this arrived on time, and that the connectors were fairly easy to use (it did require some serious pushing, at times, but that just made me feel confident it would hold its configuration). I'm honestly not sure what other reviewers meant when they said they had bad experiences with the connectors; maybe by avoiding the "lid" and the "bottom" we avoided those issues. At any rate, we're delighted with this product, and likely to buy more in the future. Next step - using Miss Piggy's old cage as a "quarantine" chamber, and hopefully adding another piggy! C:Bought these to use as a make shift enclosure for bunnies. Customizing and building is nice, no problems with bunnies breaking through or chewing. HOWEVER, beware the middle connectors become super loose after a dozen reconfigurations, making it pretty unusable without zipties. If you're buying this to make a shoe rack that you'll never move, it's perfectworks out well to separate my butterfly nurseries10/10 would recommend to friends ds a d familyThe idea is great, and it looks like, but I find the connection to be somewhat questionable.That is, I feel like I shouldn't put anything remotely heavy in it (such as textbooks or laptops) because the connectors between the walls don't seem to let me slide in the walls all the way. Perhaps if I had a hammer I could slowly force them into place, but as it stands, almost all of the connectors seem to have about a half a centimeter of empty space because I couldn't convince the walls to go in all the way.However, for what it's worth, I've had three sets of these made (one all black, two colored sets from amazon) and so far the black one hasn't crashed apart in the year that I've had it (it's holding small boxes of lightweight stuff like screwdrivers and rolls of trashbags and packages of AA and AAA batteries and other miscellaneous stuff), and the two colored ones that I've bought in the last month or so are still holding up with (at the moment, multiple pokemon card binders and shoe box filled to the brim with yugioh cards; referring to the top two compartments of each of them; the bottom compartments (that aren't really affected by weight) contain a rubbermaid shoebox sized tote of yugioh cards, multiple upper deck boxes of cards (I'd say like 6 of them, each with about 50 cards), and some more batteries).The one star deduction is because I feel like they could have made it easier to clasp the walls together - not only was it difficult to force the pieces together without hurting my fingers a bit due to the pinching involved with squeezing metal together (I say this as a 20-something year old male adult with reasonably strong fingers; I mean it didn't hurt to the point where I'd actually be like "ouch this hurts so much", but imagine the type of pain you'd get if you were trying to unscrew a stubborn screw using a terrible screwdriver), but even after I did get the pieces together, there was some empty space that led me to believe that the shelving was highly unstable (turns out it wasn't, yet, but it's also important to keep in mind the types of stuff I said I put on the shelves - it's relatively light stuff that is significantly different from the stuff I'm planning on eventually using it for, like textbooks). I believe that if I use a hammer, it may work out far better, but I don't have one at the moment (live in an apartment for school, so I didn't bring my hammer from my garage back in my 'home town', and even if I did use something else to hammer the thing together, my neighbors would likely get angry with the banging).But long story short, it still gets 4 stars because it has managed to hold together for about a year so far with the light load that I've given it to hold. We'll find out how well it does with heavier stuff and I'll update the rating in either direction depending on that (I'll probably find a way to silently hammer the walls together into a snug fit first).I bought these 10 years ago and they are still strong (heavily used to store paper and heavy clothes). I moved recently so I disassembled them and was able to rebuild them in the new place. The plastic corners are still good. I am ordering more to build a plant stand now. For those who said it is not sturdy, I guess it's because they didn't push the panels all the way into the gaps of the plastic corners. In order to do it, I use both hands and pushed each joins against the floor and from all sides. Once done, it would be very hard to take the corner apart and the whole thing will be very sturdy.These cubes are brilliant. I ordered to make a guinea pig cage, but have ordered some more to be able to mess about creating a run in the garden, some shelving for my office, storage for myson's bedroom.... My only wish is for it to be possible to order extra connectors. Nothing has broken, but I'd be rather gutted to lose the use of these cubes by having a connector break on me (and breaking is always a possibility, even with the most robust plastic items....)I'm very happy with my purchase and would buy it again. Easy to build and would recommend to anyone.Great for guinea pig C&C Cage! You can make 2X4 C&C cage and you will remain with 3 grids more that can be used to make an Layered Corner Fleece for hidden.My girls are very happy with their new cage :)The picture suggests that each panel has a 9x9 grid, but the grids I received were 8x8. I wanted to use these to build a guinea pig cage, but 8x8 grids are not safe for piggies, unfortunately.excellent easy to put together,arrived early