Hey Easy rider,

The compressibility between all three jackets will be pretty similar as in they can compress pretty well, but with a bit more of a baffle construction, the Zonal will compress more than the other two.

The Zonal Jacket will compress quite a bit more than the Compressor or the Lado due to the difference in the amount of insulation used in the jackets. I used a Zonal this weekend while climbing 2 14'eers here in Colorado in a small 6 liter pack and it fit perfectly in the bottom as that lightweight emergency layer. I hope this info helps!