KOIOS Expandable Rear Trunk Bag




Like Dr. Who’s Tardis, when first viewed this bag may appear, and indeed function, as a compact trunk bag. However, the side pockets can be unzipped to open up into two panniers, turning this into a large cpacity bag for extended trips. Additionally, the top pocket can be expanded to give the bag a total of 21.6 liters carrying capacity. Made from tough 850D nylon this bag is weather resistant and offers superior durability, while the hard base and rigid sides with soft interior padding help protect the contents.


  • Includes carry handle and removable shoulder strap.
  • Large zippered opening offers easy access.
  • Expandable top pocket.
  • Side pockets unzip to become large pannier bags.
  • Reflective strips & logo enhance visibility.
  • Bottle holder at rear
  • Safety light clip (light not included).
  • Bungee cord on top for fixing items requiring easy access.

Additional information

Weight 3.29 lbs
Dimensions 14.2 × 8.9 × 85-11.4 in
Accessories Included

Shoulder strap, bungee cord.


21.6 liters.


One main storage space (with two dividers), an extendable top pocket and two fold-away panniers.

Installation Type

Koios QR System.


850D nylon.

Optional Accessories

Weatherproof rain cover.


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