These are great. Adds a good bit of storage to a ...
931417
These are great.  Adds a good bit of storage to a wasted space.  Really good idea on the ring holder.
2132381
These are really great for saving space as they collapse into at least half the size, and the lids click on to keep them in place. Without anything in them, they are very 'flimsy' since they are made of silicone (or mostly silicone), though the lids are made of a more durable plastic with a vent in the middle to help release steam while the contents are cooling or when you put them in the microwave to heat up.

If you have something that is really hot that is of high liquid content, you may have a problem - these seem to do well with more solid form (notice this when letting them soak that they can be too malleable when filled with hot water). But for the most part, I've been using them for leftovers like rice, vegetables and the such and they work great, and I tend to wash things like this by hand so no issues with wear or spots from the dishwasher.

I'm impressed with how well the lids click into place and keep the food sealed - I was a little worried because of how flexible the containers are and the difference between the two materials, but once the lids are on, they are ON. All in all, these are great - once the food is in, they are great and work well stacking in the fridge, but when they're empty they collapse down and take up so much less space in the cupboards.
4909263
Boxes look sturdy and do what they are supposed to do: Fit under the bed and store things. Of course they are not really large and they are shallow - or they would not fit under a bed (- and of course, a storage box is not a TARDIS, so you can not put too much into it. You should measure if the size is right for you.)
Okay, they are also a little bit pricy, but the boxes have lids that prevent that things get dusty, and they turn the space under my bed into a great (and organized!) storage space for seasonal cloth and other stuff I don't need all the time. I am glad I bought them.
3697579
These are great - I hung two of them up inside a shallow part of my small closet and they've given me lots of storage in an otherwise useless space - I have perfumes in the top portion and belts/headbands etc on the hooks
1515254
These are awesome. I just moved to a smaller house and desperately needed some storage for wine and other bottles. I had one of these that I had bought ages ago and really liked it, so I bought a few more. I love that these stack and are very sturdy. They are very practical, durable, and versatile and I find them to be a good use of my limited storage space. They would be great in a wine cellar or other storage area. I have them in my dining room, next to a liquor cabinet. Personally, I think these are a bit overpriced. They are plastic. However, they are a quality product, the design is great, and I am not sorry I bought them. Even thinking they are overpriced, I would buy them again. They are pretty great.
2446765
Very nice storage.  Takes up a bit of space, but, if you can find the space, it is well worth having.  Those blades are sharp!
1508512
I love these and they do the trick.  Would be nice to have a holder for them, although they do stack nicely.
2207935
Wife loves these organizers. I installed them in our bathroom and it really help add storage in a tight spot. Great quality and wish I had gotten a couple more. Easy to mount with hardware included which makes them plenty sturdy.
433281
This are phenomenal, very versitle and useful for storing things. I use the small ones to hold socks. The rectangles for underwear and the big ones for bras. I wish they were a little taller to fit my dresser exactly, but I have a old dresser with very deep drawers. Otherwise an amazing storage solution. Makes my dresser much prettier and easier to find things.
944922
Great for adding hard drives. I bought 1 and then bought another several month later.
4570684
These are great for the side wall of my garage.  Being only 12" deep, they don't take up valuable car door opening space.  I ordered three shelf units that were delivered almost next day and in perfect condition.  The first shelf took a good hour and a half to assemble.  The second and third only took about forty minutes each.  I'll be ordering another two today.

A lot of the reviews are a bit harsh for the price paid.  These are not your three minute assembly plastic shelves (all of my plastic shelves sagged and looked ugly after a year by the way).  You will need a screwdriver and some patience.  I did not have to drill any new holes for misaligned screws.  Some twisting was required here and there but it all went together.  The only useful information in the instructions was which part of the shelf was the front and back.  Other than that, just look at the pictures on the box.  A cordless drill with an adjustable clutch was very helpful in snugging up the screws after leveling the shelf.

I don't know about 750 lbs. but these can easily hold several hundred pounds if properly distributed.  The bottom two shelves easily handled three 24-pack Coke/Pepsi cubes each.  I left one shelf off and only used six for more space between.  I plan to add the extra shelves to another section to make a cheap wine storage rack in a utility room.  These can be joined together side by side along a wall if needed.  There were plenty of nuts and bolts left over for something like this.  Be sure to put a screw through the back of one of the shelves or side rails to anchor it to the wall to prevent tipping.
179462
I bought a couple of these to provide me with a bit of extra storage. They work well, and the access time is quick. The nice feature these have is that the cap clips on to the back of the device so the two always stay together.  The price was really good on these as well.  Well worth the price.
3295235
Perfect for adding storage to your pantry. I have two, and they hold all my boxes of plastic wrap, tin foil, and storage bags.
3638962
We move a lot, so always looking for handy storage ideas for efficiency and portability.  These are another option.  We have deeper under the cabinet/shelf storage containers, so these shallower units are just right for additional storage. Currently using them for under the laundry shelf (the shelf is very high and behind the washer and dryer, so helps with reachability.  I am always satisfied with any DecoBros products.
1413590
These were better than I expected.  We are removing some old photos from old sticky photo albums and these worked great to consolidate space and keep everything nice and secure.  The plastic is sturdy and the inner and outer containers seal nicely.
339098
A bit pricey, but they are a great storage solution and well made. I generally don't store my magazines full, but the magnets are strong enough to do so if you wish. I recommend this product.
1933235
These were perfect for giving me more storage space under the bed.  I'm using the risers to get the most height, and the double bed feels quite steady.