I spotted this on the tool launch page for the DWST08017 Toughsystem to Tstak adapter - looks like it may play with the non Tstak organisers too : r/Dewalt

DEWALT® TOUGHSYSTEM® 2.0 Adaptor

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

DEWALT® TOUGHSYSTEM® 2.0 Adaptor

DEWALT Adaptor Plate for TOUGHSYSTEM 2.0 DWST08017 - The Home Depot

DEWALT® TOUGHSYSTEM® 2.0 Adaptor

Connect Tough System, Tstak, Pro Containers, and tough cases! Dewalt DWST08017

DeWalt tstak to toughsystem adaptor

TOUGHSYSTEM® 2.0 Adaptor

DEWALT® TOUGHSYSTEM® 2.0 Adaptor

DEWALT® TOUGHSYSTEM® 2.0 Adaptor

DEWALT Adaptor Plate for TOUGHSYSTEM 2.0 DWST08017 - The Home Depot

Dewalt TSTAK to TOUGHSYSTEM Adaptor!

TSTAK® V - Organizer with Clear Lid

TSTAK™ 3 pc. Modular Mobile Tower

POWER RAX for DeWalt DWST1-71195 Deep TStak ToolBox 18v XR 54V FelxVolt NO BOX

Dewalt TSTAK Tool Box Wheeled Carrier Base DWST1-71229

DeWalt TStak Inlay For 18V 115mm Brushless Compact Circular Saw