Festool Attic Lid Systainer SYS3 DF M 137 (577346)

The Festool 577346 Attic Lid Systainer SYS3 DF M 137 is a modular storage box built for keeping tools, accessories, and small parts sorted, protected, and ready to move. This is a tool storage box designed for organizing accessories, drill bits, saw blades, bits, and small hardware. Model Number: 577346. If you already work out of the Festool system or just want a cleaner way to carry fasteners and accessories without digging through a mixed bin, this one solves a real jobsite problem.

What makes this version different from a standard Systainer is the built-in lid compartment. Instead of using the top only as a cover, Festool turns it into usable storage with a transparent lid and adjustable dividers. That means your frequently used accessories stay visible at a glance and separate from the larger contents in the main compartment. For guys who lose time hunting for the right bit, anchor, screw, or small blade, that setup matters more than it sounds on paper.

The internal layout is built around flexibility. The partitions in the lid can be rearranged to fit different loads, whether you carry long drill bits, loose screws, bit holders, or small specialty accessories. Festool also designed the lid compartment to work with BKS SYS3 bit cassettes and drill bit cases, which makes it easier to build a repeatable storage setup instead of improvising one every week. Just as important, Festool is clear that it is not suitable for Systainer T-LOC bit cassettes and drill bit cases, so you know what fits before you buy.

The main body still works like the rest of the Festool Systainer platform, so you get stackable, connectable transport instead of one more loose box in the truck. It is compatible with the entire Festool Systainer system and can connect across different generations. Festool also states compatibility with transport systems and mobile dust extractors, which is a practical advantage if you already move tools and storage as one stack instead of making multiple trips.

Size is another reason this model works well in the field. The outside dimensions are 15.59 inches long by 11.65 inches wide by 5.39 inches high, with inside dimensions of 15.31 inches by 10.83 inches by 3.78 inches. That gives you useful storage without turning into a bulky crate. At 3.75 pounds, it is light enough to carry loaded without feeling like the box itself is eating up your payload. The 2.75 gallon capacity gives you room for a compact tool setup or a dedicated accessory loadout.

Load ratings here are solid and worth noting. The Systainer is rated for a 44.09 pound load, 88.18 pounds when connected, and a 220.46 pound lid load. In plain terms, this is made to be part of a stack, not a delicate organizer you baby around the shop. That matters if your storage lives in vans, gets moved from floor to floor, or rides with the rest of your kit every day.

The Festool 577346 Attic Lid Systainer SYS3 DF M 137 makes the most sense for carpenters, remodelers, installers, service techs, and serious DIY users who want a dedicated place for high-use accessories and small parts. It is especially useful if you already own Festool gear and want your storage to work with the same platform. One thing to know up front: it ships without a tool insert, so this is best for users who want open flexibility or already have a storage plan in mind.

Weight (lbs) 3.75 lb External Dimensions (L x W x H) 15.59 x 11.65 x 5.39 in Internal Dimensions (L x W x H) 15.31 x 10.83 x 3.78 in Volume 2.75 gal Load Capacity 44.09 lb Load Capacity (Connected) 88.18 lb Lid Load 220.46 lb Made In Germany

Festool 577346 Attic Lid Systainer SYS3 DF M 137 is the smart pick for guys tired of digging for bits

This is one of those storage pieces that sounds simple until you use it, then you wonder why every box is not built this way.

• Who it's for: Pros and serious DIY users who carry small accessories, drill bits, screws, and specialty parts and want them visible instead of mixed together.
• Why it stands out: The lid does real work here, with clear top storage, movable partitions, and full integration with the Festool Systainer system.
• Worth knowing: It ships without a tool insert, and it does not fit Systainer T-LOC bit cassettes, so make sure your accessory setup matches the SYS3 platform.

• What is this product designed to store? It is designed to organize tools in the main compartment and small parts like bits, drill bits, saw blades, and hardware in the transparent lid compartment.
• Does it work with other Festool Systainers? Yes. Festool states that it is compatible with the entire Festool Systainer system and can connect with different generations.
• Will it fit BKS SYS3 bit cassettes and drill bit cases? Yes. The lid compartment is designed to fit BKS SYS3 bit cassettes and drill bit cases.
• Does it fit Systainer T-LOC bit cassettes? No. Festool specifically states that it is not suitable for Systainer T-LOC bit cassettes and drill bit cases.