These are phenomenal! Got one medium for myself and one for my partner - they have transformed our packing and organization. They are super lightweight and easy to use. I will be getting a second one!
I love both the small and medium size packing cubes for the lightweight material, separate compartment for dirty clothing, and expansion zippers. I like them more than my old favorite, Eagle Creek Pack-It Specter.
I actually use these for dirty laundry while on a trip. I works great as a portable laundry basket if you don't have a way to do laundry while you're traveling and don't want to soil the rest of your clothes as well.
I bought the small and medium-sized packing cube last year and use them quite often (every Weekend). Although the cubes look good they are not as durable as marketed. The grip of the medium packing cube have unfortunately started to give up and it won't be there for a long time.
I don't carry a lot of lenses, so the medium cube is perfect for me to pack my DSLR camera, a few lenses plus GoPro and accessories, while leaving room in backpack for drone (in its own pack) and other travel gadgets. I like that I can work out of the cube, and remove it from the Travel backpack.
I bought two packing cubes (small and medium) for my travel two weeks ago. I can say they are the must have for travels. It uses high quality material with simple and elegant designs and useful features such as a separate pocket for dirty clothes. It also compresses well to fit a lot of clothes. It saves a lot of spaces and I put the medium size into my check-in luggage and the small size into my carry-on. They work great!