Admittedly it's lazy marketing to just claim Peak's Packing Cubes are 'the best.' But with their dual storage zones, UltraZips, expansion/compression, and self-healing 100% recycled shells, they go out of their way to be awesome and are designed more like a full-on bag than just an insert.
Expand & Compress
Expansion/compression zip provides additional space, plus the ability to compress contents once packed
In the compressed state, fit 2 Packing Cubes in the space of 1
Smart Access & Storage
Ultra-fast tear-away main opening
Dual compartments for separating clean and dirty clothes
Moving divider auto-adjusts size of each compartment
Top and bottom handles for easy handling
Use It For Decades
#5 UltraZips built to withstand decades of use thanks to the proprietary abrasion-resistant thread