REI Co-op Junction Seat Bag
Consider the water-repellent REI Co-op Junction seat bag an underseat glove box for your ride essentials. It's light and unobtrusive, yet roomy enough to hold a mini U-lock, patch kit, tubes and more.
- Seatpost wrap and compression wing with strap make it easy to attach securely to your bike
- Rugged, recycled oxford nylon shell fabric resists water, abrasion, punctures and tearing
- Durable water repellent (DWR) treatment made without PFAS repels light rain and tire spray
- HDPE foam structure provides necessary support to maintain stability and shape
- Large main opening for easy access to your essentials
- 2 internal mesh pockets and key clip
- Reflective logo and reflective mounting tab for a blinky light (light not included)
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
- Contains materials that meet the bluesign® criteria
Imported.
View the REI Co-op Junction Product LineView all REI Co-op Saddle PacksBest Use | Cycling |
---|---|
Gear Capacity (L) | 3 liters |
Gear Capacity (cu. in.) | 183 cubic inches |
Material(s) | Shell: 100% recycled oxford nylon (bluesign approved); lining: 100% recycled polyester (bluesign approved) |
Dimensions | 10 x 5 x 5 inches |
Weight | 6.5 ounces |
Sustainability | Contains materials that meet the bluesign® criteria Contains recycled materials From a Climate Label Certified brand |
Better gear is built together
From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.


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Good bag, can be better with one minor change
Bag is great, but seat post velcro is too short for the larger diameter posts.
Goldilocks size.
Big enough to fit tubes, tools, an extra layer, and a minipump. It's hard to find a seat bag that isn't too roadie-small or too bikepacking-large. Seems to be nicely made. Thanks, REI!