I haven't seen the
Rick Steves packing cubes in person, but here's a few of the differences between his and ours:
1)
TOM BIHN Packing Cubes are sized specifically to maximize utility of the compartments of the Aeronaut (or Western Flyer). Rick Steves' packing cubes are sized to fit Rick Steves' bags.
2) Rick Steves' packing cubes are made entirely out of mesh. The TOM BIHN Large, Small, and End Fabric/Mesh Packing Cubes feature one side in Japanese Dyneema Rip-Stop fabric and the other side in high-quality mesh. The TOM BIHN End Fabric/Fabric Packing Cube is all Dyneema fabric, and is great for separating shoes or other items from the rest of your gear. It's up to you whether 100% all mesh or mesh/Dyneema or Dyneema/Dyneema will work best for you. Personally, I like the "body" that the Dyneema gives our packing cubes, without adding any extra weight.
3) TOM BIHN Packing Cubes are more expensive.