The Festool Attic Lid Systainer SYS3 DF M 137 with LEYSYS-FT1 Spirit Level is a two-piece Festool storage bundle for carpenters, installers, and remodelers who want their accessories organized and a compact level always at hand. This is a tool storage case designed for organizing bits, drill bits, saw blades, and small parts, paired with a spirit level for layout and setup work. It combines the Festool 577346 Attic Lid Systainer SYS3 DF M 137 with Festool's LEYSYS-FT1 level.

What sets the DF version apart is the lid compartment. Instead of using the top only as a cover, Festool turns it into storage with a transparent lid, so you can see the contents without opening the case. Adjustable partitions divide the lid compartment to suit long drill bits, saw blades, driver bits, or loose small parts. Everything bulkier goes in the main body below: machines, hand tools, and the rest of your kit.

The second piece is the Festool LEYSYS-FT1 spirit level, a compact level made by BMI in a Festool design. It has one horizontal and one vertical vial with a measuring accuracy of 0.012" per foot (1.0 mm/m), a metric scale on the front, and an inch scale on the back. Festool designs it to store securely in the handle of Systainer3 cases (Systainer3 ToolBoxes and the Systainer3 ToolBag excepted), so it travels with your storage instead of rattling loose in the truck.

The level body is a solid, naturally anodized aluminum profile with ABS end details, 13-15/16" (354 mm) long and about 0.6 lb. Its prismatic contact surface seats properly on pipe, tube, and round shafts. It is made in Germany.

The lid compartment works with Festool's BKS SYS3 bit cassettes and drill bit cases, such as the 577779 BKS SYS3 drill and driver bit cassette. The cassettes fit the compartment and lift out to use on their own. Systainer T-LOC bit cassettes and drill bit cases do not fit, so check what you own before planning your layout.

The case is compatible with every Systainer generation, so it connects to older T-LOC Systainers as well as current Systainer3 cases. Festool also rates it for use with its transport systems and mobile dust extractors, which means your accessory case can ride on top of the extractor with the rest of the stack instead of making a separate trip.

Inside, the main compartment matches the interior of Festool Systainer3 M models, so inlays you already have will fit. Outside, it measures 15-9/16" x 11-5/8" x 5-3/8" (396 x 296 x 137 mm), with inside dimensions of 15-5/16" x 10-13/16" x 3-3/4" (389 x 275 x 96 mm) and a volume of about 2.75 gal. The empty case weighs 3.75 lb (1.7 kg). It is rated for a 44 lb (20 kg) load, 88 lb (40 kg) when connected, and 220 lb (100 kg) on the lid. The case ships without a tool insert.

Who should buy it? Carpenters, cabinet installers, remodelers, and service techs who already work out of Festool storage and want a dedicated accessory case with a level that never goes missing. If you carry a lot of bits and blades, the lid compartment alone earns its spot in the stack.

The Festool Attic Lid Systainer SYS3 DF M 137 with LEYSYS-FT1 Spirit Level Makes Every Inch Count

A Systainer that uses its lid as storage, plus a level that lives in a Systainer3 handle, is about as tidy as accessory storage gets.

• Who it's for: Festool users who carry a lot of bits, blades, and small parts and want them visible without unpacking the case.
• Why it stands out: Transparent lid compartment with adjustable partitions, compatibility with BKS SYS3 cassettes, and full Systainer connectivity across generations.
• Worth knowing: The case ships empty with no tool insert, and older T-LOC bit cassettes do not fit the lid compartment.

• How is this different from a standard Systainer3 M 137? It adds a transparent, partitioned storage compartment built into the lid.
• Will my Systainer3 M inlays fit? Yes. The internal dimensions match Systainer3 M models.
• Does it work with my older T-LOC Systainers? The case connects to all Systainer generations, but T-LOC bit cassettes and drill bit cases do not fit the lid compartment.
• Does the level read in inches? Yes. The front has a metric scale and the back has an inch scale.