Love these! Even if you are an efficient packer, these enable you to get more in the same space. I only took carryon and these enabled me to pack better. The zippers are sturdy. Your suitcase looks very neat.  I had to open my suitcase for TSA at the airport and the whole suitcase didn't have to get unpacked, just the cube in question. Good sizes in this set. I especially like the smaller ones for corralling socks and smaller pieces of clothing.