Systems people ask about
These come up in searches next to Flex STACK PACK. We have no source saying any of them locks onto it, so mixing them means separate stacks. Each comparison lines the two lineups up part by part.
The Flex STACK PACK lineup
Flex STACK PACK is Flex's modular tool storage system, launched in 2022. Modular Toolbox lists 24 products in it: 3 tool boxes, 2 drawer boxes, 1 crate, 3 small-parts organizers and more. Prices on file run from $19.99 to $329.00. Sold only at Lowe's.