Roll Out Seat Post
Bag for Bikes 12L
Adsports ASSB12LWP


Availability: In stock

SKU: ASSB12LWP Categories: ,

Great value roll out seat post bag for bikes. Features an adjustable storage capacity rolling out to a storage capacity up to 12 liters. It functions pretty much the same as a dry bag keeping the contents dry during most downpours.

The best thing about these bike saddle bags is they do not require a bicycle pannier rack to be used. They simply attach to your existing bikes seat post. So quick and easy to install!


  • Waterproof construction with from a TPU coating.
  • Roll-top closure for easy access and secure sealing.
  • Reflective material for increased visibility at night.
  • Expands up to 12 liters of capacity or rolls down to a small size.


  • Keep your gear dry in wet and rainy weather.
  • Easily access your gear with the roll-top closure.
  • Be more visible at night and safer with the reflective material.
  • Carry more or less gear with the expandable design.

For increased visibility while riding at night reflective strip has been positioned on the rear of the saddle bag.  As well there are also two reflective patches on each side of the bag. This is particularly useful if the bag obscures your existing rear reflector. Because of this it becomes more than just a bag it also becomes a safety device for your bike.

Reflective strip on 12L roll out bike bag

The bag is made from quality materials with a high quality of workmanship. The bag is well stitched with stitching reinforced at key points on to ensure the bag lasts you for many journeys to come. To ensure everything inside is kept dry the bag lined with waterproof polyester.

waterproof interior

As well as a high quality of workmanship these bags use high quality buckles to ensure the bags stay attached to your bike.

Roll Out Seat Post Bag BS12L Specifications

  • Fabric: waterproof Polyester and 900D Polyester.
  • Number of compartments: 1 large main compartment.
  • Bag volume: Expandable up to 12 Liters.
  • Mount on bike: Seat post mount.
  • Attachment system: Buckled belts with hook & loop straps.
  • Water Protection: Rain proof.
  • Brand: Adsports.


  • Bag Size: 50 x 28 x 22 cm.
  • Weight: 480 grams +/- 5%.

The Adsports 12L Roll-Out Seat Post Bag is the perfect way to carry all of your essentials on long rides. It is made from waterproof materials and has a roll-top closure for easy access and secure sealing. The bag can be attached to your seat post with the provided straps and has reflective material for increased visibility at night.  The bag can be expanded to 12 liters of capacity, making it a great option for carrying more gear on longer rides.

Please Note

For added protection we recommend all sensitive items such as electronic devices be stored inside another bag with this bag. Over time the bag could lose it’s waterproofness so better to err on the side of caution.

We have a great range of bikepacking bags available in our range. Visit our bike bags section to see what else we have available.

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