These aren't my first set of packing cubes but I tell you these will be my last. The sizes are great and the most important part... the ZIPPERS. The zippers are sturdy and smooth. I wasn't worried about them splitting at any point and they stood up to my pack and re-packing all throughout Greece for two weeks. I highly recommend these. Do not waste your money on the cheaper versions like I did before. Oh, and I loved the bright blue color.