These bags are money!
They are sturdy, last a long time, and definitely worth the money.

Purchased them a few years ago and still in perfect condition. Just bought more for a trip.

Loving these for my diaper bags. They fit so well in my diaper backpack and leave plenty of room for whatever else I want to toss in as I'm running out the door. All cubes have gussets on the sides so they don't open all of the way and your items tumble out. They open plenty wide to see what's inside. They all also have an elastic mesh pocket on the inside. The see through cover makes it convenient to know which cube you're grabbing. I use a backpack (Allcamp diaper backpack) for long outings and a smaller bag (jujube hobobe) for quick trips. I like that I don't need to unpack and repack when I want to switch bags. I just grab whichever cube(s) I need and put in my smaller bag and I'm out the door. I own two sets of these cubes.
Large cube - Diapers (currently using size 4 and they fit), a thin change pad that folds small (mine is from my jujube bag), clorox wipes to clean pad, butt cream, and wipes in a huggies clutch and carry
Large cube - Small toys and coloring/drawing items
Medium cube - Assorted snacks for me and kids
Medium cube - It's a tight fit but I managed to fit socks, underwear, pants, shirt for the 4 year old AND socks, pants and onesie for 17 month old
Small cube - Assorted medical supplies/personal supplies. I don't carry a lot of medical items since we have a first aid kit in the car.
Currently not using the other small cube. But it would be great for electronics like earbuds, phone cord, charging pack, etc.

Structured, so items don't shuffle around inside the bag, see through, so items are easy to find, compact, so it slips easily into luggage, backpack or purse. I include these packing squares with every wedding gift.

Purchased a couple of these a few years back. Glad I found them again. Primary use is for keeping phone/camera chargers, cables, and accessories in one place for travel. Very handy for that. Have also used to keep spare keys in one place when on extended trips. Never want to be halfway across the country when you lose your car fob - have a spare back at in your luggage!.

We've used these for many years for travel for our electronic cords, plugs & earplugs. My husband has used the middle size for many years. I have used the small one which wasn't big enough for what I needed so I purchased another set. The large was was too large for my needs. These hold up well & still look good as new after many years of use. Of course these can be used for small items, toiletries, snacks or whatever needed in a carryon bag or purse. I highly recommend these!