Is the Transporter 65 carry-on size?

No. At 65 liters it is too large for most airline carry-on limits and is meant as a checked or road-trip bag. For carry-on travel, look at the 40-liter version.

Can it be worn as a backpack?

Yes. The shoulder straps stow behind a zip panel and deploy when you need them, so it works as a duffel or a backpack. The harness is simple and suited to transit, not long trails.

How does it compare with the Patagonia Black Hole duffel?

The Transporter is lighter and has a more comfortable backpack carry, while the Black Hole has a burlier, more weatherproof shell and more lash points. Both are durable; pick the Osprey for carrying comfort and the Patagonia for abrasion resistance.

It is water-resistant, not waterproof. The coated nylon and weatherproof zip flap shed rain, but the bag is not submersible and has no sealed dry-bag closure.

The duffel comes with its stowable backpack harness and a removable padded shoulder strap. It does not include packing cubes or a rain cover.

Does it have a lockable zipper?

The main compartment uses a zippered flap rather than lockable sliders, so it is not designed for checked-bag locking. Use a travel lock on the slider or a cable lock through the grab handles.