Warrior Assault Systems Falcon Chest Rig
Fallout 4 Inspired Leather Chest Piece Harness Kit by LeatherCladLegends on Etsy https://www.etsy.com/listing/260286564/fallout-4-inspired-leather-chest-piece

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This would be the best! Doesn't interfere with the backpack. Perfect. Load Bearing Chest Rig
Awesome FRONT OPENING chest rig. Easy on, easy off and capable of holding hard armor.
chest rig - Soldier Systems Daily
Tactical Tailor – CSAT Chest Rig
D3CRX Disruptive Grey chest rig
Spiritus Systems Micro Fight Chest Rig System MK 2 (5.56)