The Festool 577819 SYS3 S 76 TRA UNI Systainer is a compact storage organizer built for small parts, accessories, and hand-held tools that need to stay sorted and protected. This is a Systainer organizer designed for organized storage and transport of small parts and accessories. Model number 577819. If you work out of a van, shop, or modular storage setup and constantly deal with loose hardware, this little case solves a very real problem without eating up space.

What makes this one useful is the layout. Festool includes the TZE-UNI SYS3 S 76 multi-purpose insert, which gives you divided spaces for hardware and accessories instead of one open box where everything mixes together. The transparent lid helps you identify contents quickly before you even open it, which is a small detail that matters a lot when you are trying to grab the right connector, screw, or fitting and move on.

The overall size is compact at 10-7/16" x 6-3/4" x 2-13/16" (265 x 171 x 71 mm), with inner dimensions of 10-3/16" x 6-7/16" x 2-5/8" (258 x 164 x 67 mm), so it is clearly aimed at fasteners, terminals, small consumables, and similar jobsite essentials rather than bulky tools. At 1.32 lbs, it is light enough to carry individually, and the low-profile body makes it easy to tuck into a larger storage plan without wasting room. This is the kind of organizer that works best when you want a dedicated place for the small stuff that usually disappears into pockets, bins, and the bottom of tool bags.

Festool also built this SYS3 S 76 TRA UNI around modular storage. It is suitable for the Systainer3 Rack, which can hold six Systainer3 S 76 units in a shelf-style format. That gives you a cleaner way to separate categories like electrical connectors, cabinet hardware, finish screws, or install accessories while still keeping everything in one organized system. The connected load capacity is rated at 33.06 lbs, and the lid load is rated at 220.4 lbs, so the unit is designed to hold up inside a real working storage setup.

Compatibility is important here because not every Festool box connects to every other one. This organizer can be combined with others of the same type and with SYS-MINI 1 TL. It is also listed as compatible with SYS-MINI 1 and 3 TL. Just as important, it is not meant to connect to SYS 1-5, SORTAINER, SYS MINI classic, or older Systainer families. If you already run a Systainer3 Rack or MINI-Systainer setup, this is a clean add-on. If your storage is built around full-size Systainers only, check fit before you buy.

On the job, the value is simple: better organization, faster access, and less wasted time chasing small parts. Electricians, installers, finish carpenters, service techs, and serious DIY users will get the most out of it because those are the people constantly managing a lot of small pieces that all look similar until they are mixed together. If your main need is to organize fasteners, fittings, anchors, terminals, or small hand tools in a compact modular box, this is exactly what the Festool 577819 SYS3 S 76 TRA UNI Systainer is built to do.

Festool 577819 SYS3 S 76 TRA UNI Systainer for the small stuff that usually gets lost

This is a smart buy for anyone already working in a modular storage system and tired of loose hardware taking over drawers, bags, and bins.

• Who it's for: Pros and organized DIY users who carry screws, connectors, anchors, fittings, and other small parts between the shop, van, and jobsite.
• Why it stands out: The divided insert, transparent lid, and Systainer3 Rack compatibility make it more useful than a generic parts box.
• Worth knowing: This is a small-format organizer, not a universal Systainer that connects across every Festool storage family, so check compatibility if your setup is built around older systems.

• What is this product mainly used for? It is built for organized storage and transport of small parts, accessories, and hand-held tools.
• Does it work with the Systainer3 Rack? Yes. It is suitable for the Systainer3 Rack.
• Can it connect with all Festool Systainers? No. It cannot be connected to SYS 1-5, SORTAINER, or SYS MINI classic, and it has limits with older systems as well.
• How much weight can it carry? The rated load capacity is 11.02 lbs, with a connected load capacity of 33.06 lbs and a lid load rating of 220.4 lbs.