Flat profile — fits where round bags don't

At 200 mm (8 inches) deep, the FlatFold Bag S is thin enough to stand upright in a boot, slide along a hallway wall, or fit in compartments that don't accommodate a conventional cylindrical bike bag. A folded Tern bike is naturally flat — the bag's profile matches the bike's form rather than adding unnecessary depth. This makes the bagged bike easier to move through doorways, position in vehicles, and store in residential spaces without taking up disproportionate floor area.

Two pairs of handles — four carrying points

At over 1.5 metres long and containing a folded e-bike, the FlatFold Bag S can be heavy and awkward for one person. Two pairs of handles — one at each end, or one on each side — give four distinct carrying points. A second person can take one pair while the first holds the other, distributing the weight across two people for stairs, tight corridors, and vehicle loading. When carrying solo, the two pairs allow switching grip position to distribute fatigue across different muscle groups.

Physis handlepost — what it means for compatibility

The Physis handlepost is a specific handlepost design used on a range of Tern folding bikes including the NBD. When folded, a Physis handlepost collapses flat alongside the frame rather than creating a bulge — this flat fold is what allows the bike to fit the FlatFold Bag S's slim profile. Bikes with a different handlepost design fold to a different shape that may not fit the bag correctly. Confirm your bike uses a Physis handlepost before ordering.

Internal zip pocket — pedals and tools contained

Removed pedals have metal threads and corners that scratch frame paint and componentry when loose inside a bag. The internal zip pocket keeps pedals, multi-tools, a lock, and small accessories separated from the bike's surfaces. Everything that comes off the bike for transport goes into the pocket; nothing rattles against the frame during carrying or vehicle transit.

Bluesign nylon — padded, water-resistant, sustainable

Bluesign certification covers the dyeing and finishing process for the nylon — same certification used in the Cargo Hold pannier fabric. The nylon is water-resistant and easy to wipe clean of mud, grease marks, and road grime. The padding provides scratch protection for the bike inside and gives the bag enough structure to hold its shape without the bike inside — useful for storage when the bike is in use and the bag sits empty.

Ground transport vs airline — what this bag is for

The FlatFold Bag S is a ground transport and storage bag — not an airline travel solution. For airline travel, the FlightSuit ($124) provides padding for a standard suitcase, or the AirPorter Slim ($476) is a dedicated hard-shell airline case. The FlatFold Bag S covers the everyday scenarios: loading the bike into a car, storing it at a venue, protecting it during short-haul rail or bus travel, and keeping it clean in residential storage. It is lighter and less expensive than an airline-specific solution because it doesn't need to meet airline baggage protection standards.