Back-Chestpack constructions

The concept I liked and worth considering. I did myself a similar construction of two backpacks.
What needed is in quick access put to the front backpack.

Marom-Dolphin Combat Fusion bags

Airflo Outlander Back-Chestpack

43x26x33cm.

William Joseph Exodus-II 45289 Back-Chestpack

58x38x25cm
1500g / (3.2 lbs.)
AirTrack™
Zip-No™

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Source: Balance - U Flow

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Similar from 5.11 tactical - CloudStryke Pack 18L. Finally gave birth