I spotted this on the tool launch page for the DWST08017

DEWALT® TOUGHSYSTEM® 2.0 Adaptor

DEWALT ToughSystem 2.0 Adaptor - Bliffert Lumber and Hardware

DEWALT Adaptor Plate for TOUGHSYSTEM 2.0 DWST08017 - The Home Depot

DEWALT TOUGHSYSTEM 2.0 Tool Storage Adaptor, Connecting DEWALT TOUGHSYSTEM 2.0 products to DEWALT TSTAK (DWST08017) : Tools & Home Improvement

You See This Dewalt Tough System 2.0 Sale?

DEWALT® TOUGHSYSTEM® 2.0 Adaptor

DEWALT TOUGHSYSTEM 2.0 Adaptor DWST08017 - Acme Tools

Toolboxes

New TSTAK Job Chest : r/Dewalt, tstak