FLEX’s modular wall storage system is now shipping. The TRACK-LOCK™, first shown at the 2025 SEMA Show, is hitting dealers and Amazon in March 2026, and it has one trick no other wall storage system currently offers: direct compatibility with FLEX STACK PACK tool boxes.
What TRACK-LOCK Is
The system starts with a 32″ Wall Mount Rail (model FS1501) that anchors to standard 16″ on-center studs. Hooks, racks, and shelves attach via a Quick-Clamp Mounting System, no tools required. You can reposition any attachment anywhere along the rail in seconds, which matters when a job changes or shop layout evolves.
Each rail handles up to 75 lbs. Endcaps are removable so rails can be mounted flush side-by-side to cover an entire wall section. The system accommodates power tools, hand tools, long-handled gear, cords, and supplies, anything you’d hang or rack in a garage or van.
The STACK PACK Integration
The standout feature is cross-compatibility with FLEX’s STACK PACK portable tool storage. Dedicated Front Mount Rails and Side Mount Rails clip onto the outside of STACK PACK boxes, letting you use the same TRACK-LOCK hooks and accessories on your boxes that you use on your wall.
The practical payoff: your shop wall and your job site stack share one accessory system. Pack up in the morning, go to the site, and your STACK PACK boxes arrive with the same hooks, racks, and organization you used on the wall. No separate clip sets or adapters for each context.
No competing system, Milwaukee PACKOUT, DeWalt TSTAK, or ToughSystem 2.0, currently offers this wall-to-portable box accessory compatibility.
Who It’s For
If you’re already running FLEX STACK PACK boxes, TRACK-LOCK is the obvious wall companion. If you’re building a new shop or van setup from scratch, FLEX is now the only cordless tool ecosystem where the same storage accessories work on your wall and your toolboxes.
FLEX tools sit squarely in the pro-grade segment, brushless motors, solid build quality, positioned to compete with Milwaukee and DeWalt at a slightly lower entry price. The STACK PACK system has built a following among contractors who want modular portability without Milwaukee pricing. TRACK-LOCK extends that logic to the shop wall.
FLEX products are available on Amazon. The TRACK-LOCK 32″ Wall Mount Rail (FS1501) and compatible attachments are now shipping through Amazon and authorized FLEX dealers. For a full look at how FLEX fits into the modular storage landscape versus Milwaukee PACKOUT and DeWalt ToughSystem, see our Best Tool Storage Systems 2026 guide. And if you’re building out a FLEX cordless kit to go with it, our Best Cordless Combo Kits 2026 and Battery Platforms Compared guide cover where FLEX stacks up against the competition.
Sources: Ohio Power Tool News · ToolGuyd · FLEX press release via Yahoo Finance