# Flex STACK PACK vs ToughBuilt StackTech

> Flex STACK PACK and ToughBuilt StackTech don't stack together: we have no source saying either locks onto the other. Flex STACK PACK has 24 products on sale across 10 categories, priced $19.99 to $329.00. ToughBuilt StackTech has 19 products on sale across 9 categories, priced $65.00 to $119.95. Biggest tool box by outside volume: Flex STACK PACK Cabinet at about 23 gal against ToughBuilt StackTech XL Tool Box at about 23 gal. Highest rated load: 300 lb (Flex STACK PACK) against 800 lb (ToughBuilt StackTech).

| | [Flex STACK PACK](https://modulartoolbox.com/lines/flex-stack-pack/) | [ToughBuilt StackTech](https://modulartoolbox.com/lines/toughbuilt-stacktech/) |
|---|---|---|
| Launched | 2022 | 2023 |
| Products on sale | 24 | 19 |
| Categories | Tool Boxes (3), Drawer Boxes (2), Crates & Totes (1), Small-Parts Organizers (3), Rolling Cases (2), Dollies & Carts (1), Mobile Workstations (1), Wall Mounts & Hangers (6), Bags & Pouches (4), Accessories (1) | Tool Boxes (4), Drawer Boxes (2), Crates & Totes (1), Small-Parts Organizers (3), Rolling Cases (1), Dollies & Carts (3), Wall Mounts & Hangers (1), Coolers (2), Bags & Pouches (2) |
| Price range | $19.99 – $329.00 | $65.00 – $119.95 |
| Biggest tool box | STACK PACK Cabinet (22 × 15.1 × 16.3 in) | StackTech XL Tool Box (21 × 16 × 15.6 in) |
| Highest rated load | 300 lb (STACK PACK Wall Mount Rail, 2-Pack) | 800 lb (StackTech 2-in-1 Convertible Hand Truck) |
| Weather rating | none published | IP65 on 1 |
| Where sold | only at Lowe's | Lowe's, Acme Tools |

## Questions

**Do Flex STACK PACK and ToughBuilt StackTech stack together?**
No. We have no source saying Flex STACK PACK and ToughBuilt StackTech lock onto each other, so mixing them means two separate stacks.

**Which is cheaper, Flex STACK PACK or ToughBuilt StackTech?**
On the prices we have (as of October 3, 2026), the cheapest Flex STACK PACK tool box is the [STACK PACK Suitcase Tool Box](https://modulartoolbox.com/products/flex-stack-pack-suitcase-tool-box/) at $87.00, and the cheapest ToughBuilt StackTech tool box is the [StackTech Tool Box](https://modulartoolbox.com/products/toughbuilt-stacktech-tool-box/) at $65.00. Prices are re-checked weekly.

**Which has more products, Flex STACK PACK or ToughBuilt StackTech?**
Flex STACK PACK: 24 products on sale across 10 categories. ToughBuilt StackTech: 19 across 9.

**Which holds more weight, Flex STACK PACK or ToughBuilt StackTech?**
By the brands' own ratings, the most any Flex STACK PACK piece is rated to carry is 300 lb ([STACK PACK Wall Mount Rail, 2-Pack](https://modulartoolbox.com/products/flex-stack-pack-wall-mount-rail-2-pack/)); for ToughBuilt StackTech it's 800 lb ([StackTech 2-in-1 Convertible Hand Truck](https://modulartoolbox.com/products/toughbuilt-stacktech-2-in-1-convertible-hand-truck/)). Ratings are per piece, not per stack.

**Which is more weatherproof, Flex STACK PACK or ToughBuilt StackTech?**
Flex STACK PACK publishes no IP rating; ToughBuilt StackTech publishes IP65 on 1 of its 19 products. IP65 means dust-tight and protected from water jets, not submersion.

Full product lists with specs and sources: [Flex STACK PACK](https://modulartoolbox.com/lines/flex-stack-pack/index.md), [ToughBuilt StackTech](https://modulartoolbox.com/lines/toughbuilt-stacktech/index.md). Page: https://modulartoolbox.com/vs/stack-pack-vs-stacktech/

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Modular Toolbox lists modular tool storage from every brand side by side, with a source for every spec. [How we compare](https://modulartoolbox.com/how-we-compare/). Data as of 2026-10-03.