Short answer: No, not natively. DeWalt runs two separate modular storage lines — TSTAK and ToughSystem/ToughSystem 2.0 — and DeWalt’s own pages state broad compatibility within each line, but the two lines only connect to each other through a dedicated bridge product, the TOUGHSYSTEM 2.0 Adaptor (DWST08017).
Two systems, each compatible with itself
DeWalt states its TSTAK Deep Tool Box “is compatible with all TSTAK modules for added convenience,” and that “all units can be stacked underneath this unit using durable side latches.” Separately, DeWalt states its ToughSystem 2.0 Two-Drawer Unit is “designed to be compatible with any TOUGHSYSTEM or TOUGHSYSTEM 2.0 product” — meaning the original ToughSystem line and the newer ToughSystem 2.0 line connect to each other natively, no adapter required between those two.
| System | Stacks natively with |
|---|---|
| TSTAK | All TSTAK modules (DeWalt’s own wording) |
| ToughSystem (original) | Any ToughSystem or ToughSystem 2.0 product |
| ToughSystem 2.0 | Any ToughSystem or ToughSystem 2.0 product |
What doesn’t stack without help: TSTAK and ToughSystem 2.0
TSTAK and ToughSystem 2.0 are DeWalt’s two separate storage platforms, and neither product line’s own page claims direct compatibility with the other. The clearest evidence of this is the adapter DeWalt itself sells specifically to bridge them: the TOUGHSYSTEM 2.0 Adaptor (DWST08017), whose stated purpose is “connecting TOUGHSYSTEM 2.0 products to DEWALT TSTAK modules” — along with ToughCase sets and five named PRO organizer models (DWST14121, DWST14825, DWST14925, DWST14830, DWST14835). DeWalt also states this same adaptor “auto-connects to all TOUGHSYSTEM 2.0 modules,” confirming that within ToughSystem 2.0 itself, no adapter is needed at all — the adaptor’s entire job is the TSTAK/ToughCase/PRO-organizer bridge, not connecting ToughSystem 2.0 to itself.
A minor wording inconsistency, stated as-is
DeWalt’s own materials don’t perfectly agree on how completely ToughSystem 2.0 covers original ToughSystem 1.0 gear. The DWST08320 Two-Drawer Unit product page says compatible with “any” ToughSystem or ToughSystem 2.0 product. DeWalt’s official ToughSystem 2.0 launch press release instead says it “is compatible with most original ToughSystem 1.0 products” and “adds 20% more storage capacity.” This guide states both exactly as DeWalt wrote them rather than picking one as more authoritative — if a specific older ToughSystem 1.0 product’s fit matters, checking that item’s own current DeWalt product page is the reliable way to confirm it.
What this guide does not claim
No DeWalt page reviewed for this guide names which specific original ToughSystem 1.0 products fall outside the press release’s “most” qualifier. Several third-party sources online do name specific products, but since none of those claims was confirmed against a directly-fetched DeWalt source during this review, this guide doesn’t repeat them. DWST08320’s product page states two different load-capacity numbers in different sections (22 lb and 25 lb) — both are reported here rather than silently resolved to one.
How this was checked
Facts on this page are drawn from DeWalt’s own TOUGHSYSTEM 2.0 Adaptor product page, the ToughSystem 2.0 Two-Drawer Unit product page, a TSTAK Deep Tool Box product page, and DeWalt’s official ToughSystem 2.0 launch press release.
Sources checked: 2026-08-06. A new review date will only be set after the linked pages are re-checked.