I was a skeptic of packing cubes because I figured if your a good packer you don't need things like this. As someone who travels quite often, I considered myself a very effective packer. Even as such, these cubes really help condense the packing and stretch inches so I can now officially be an over packer, and still get everything I need in just  my carry-on. Met my needs perfectly, and have so far been very durable from business to camping trips.