The Festool 204866 Systainer3 Open Top ToolBox M 237 is an open-top jobsite storage box built for carrying hand tools, consumables, and accessories in a stackable Systainer format. This is a toolbox designed for fast access and organized transport on the jobsite and in the shop. Model Number: 204866.

What makes this one different from a basic plastic tote is that it is not just a bin with a handle. Festool built it around the Systainer system, so you can keep the speed of an open-top toolbox while still connecting it to other Systainers with T-LOC. If you already organize your setup around Festool storage, this gives you a place for the items you reach for constantly, like caulk, layout tools, drivers, fasteners, blades, and install supplies.

The size matters here too. With outside dimensions of 15.59 in. x 11.65 in. x 9.33 in. and a 5.65-gallon capacity, the SYS3 TB M 237 is compact enough to carry comfortably but large enough to hold the daily-use gear that usually ends up loose in the van or scattered across a bench. The foldable handle is a smart piece of the design because it gives you a strong carry point, then stays out of the way when you need the opening clear for larger items.

Festool rates the load capacity at 44.09 lb, and up to 88.18 lb when connected, which tells you this is meant for real work, not light-duty garage storage. The high-quality plastic construction keeps weight down at about 3.75 lb while still giving the box the rigidity needed for transport, stacking, and daily abuse. For a mobile setup, that balance between low empty weight and useful load capacity is exactly what you want.

On the practical side, this toolbox is built for movement. It works in the workshop, in the truck, and on the construction site because it connects to other Systainer generations and is compatible with Festool transport systems and mobile dust extractors. That means you can build a stack that keeps protected tools below and quick-grab supplies on top. For installers and service work, that is a better setup than digging through closed cases every few minutes.

The Festool 204866 Systainer3 Open Top ToolBox M 237 is a strong fit for remodelers, finish carpenters, painters, installers, and general contractors who want cleaner organization without slowing themselves down. If you need sealed storage for delicate tools, a closed Systainer makes more sense. If you need quick access to the stuff you use all day, this open-top toolbox is the better call.

Festool 204866 Systainer3 Open Top ToolBox M 237 is the right call when speed matters more than a lid

This is a smart add-on for anyone already working out of Systainers and tired of burying everyday supplies in closed cases.

• Who it's for: Pros and serious DIY users who carry hand tools, caulk, fasteners, and install supplies from the van to the workspace and want them easy to reach.
• Why it stands out: It gives you real toolbox access while still locking into the Festool Systainer system, which is the whole advantage here.
• Worth knowing: This is open-top storage by design, so it is about access and organization, not sealed protection like a closed Systainer.

• Does this toolbox connect to other Festool Systainers? Yes. It connects to Systainer3 units and other Systainer generations using the T-LOC system.
• Can it be used with Festool mobile dust extractors? Yes. Festool states it is compatible with mobile dust extractors as part of the Systainer system.
• How much weight can it carry? The rated load capacity is 44.09 lb, and the connected load capacity is 88.18 lb.
• What is this toolbox best used for? It is designed for practical transportation of hand tools, consumable materials, and accessories where quick top access matters.