I've used and hated space bags over the years, they don't stay sealed, they don't vacuum flat, you can not easily stage or store the bags, especially the larger sizes. Then along came this design and it changes everything. The bags vacuum down into roughly a cube shape, they take up a lot less room and you can actually stack them in a closet. I was able to get 2 king size comforter sets into one jumbo cube bag and once vacuumed it was about the size of a bankers box. This cube now fits easily onto the shelf in my closet with room to spare. However, I would not necessarily recommend the super cube, it has a slightly different design and is awkward to use. But if you have some bulky blanket, pillows, etc. to store you will definitely find these bags to be a game changer too!These are huge and hold alot.very strong. The suction pieces have vents that you turn to control the air flow. Pack them carefully though so when suctioning your items don't block the ventsLittle too long but good quality. Thank UI was able to put a king size comforter, sheet set, 20 towels, several wash cloths, and 2 pillows and I still had room. Make sure to turn the knob before vacuuming so it goes fast. I will definitely purchase more.But seriothese worked great for condensing blankets and winter wear fir n y camping trip so I can fit more crap in my car!Also used to stuff all my dirty laundry in so it was easy peesy!Bring a few extra incase they dont all make it lolI liked the way it worked. Much better than the ones I bought at a store. Very pleased.Very easy to use. These storage bags fit a lot in them.