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Outpost Seat Pack & Dry Bag

2.5 out of 5 stars
2 Reviews



Outpost Seat Pack & Dry Bag

Not quite falling into the category of pannier or backpack, the Blackburn Outpost Seat Pack & Dry Bag sits in a class of its own, relying on a functional seatpost-mount design that includes a waterproof dry bag to keep your bikepacking or commuting essentials safe from the elements. Daisy chain loops along the outside of the bag help you corral extra lights and other gear while the entire design sits cleanly below your saddle and out of the way of your frame. Please note that the Outpost Seat Pack is not recommended for use with carbon seatposts.


  • A carry-anything seat pack for your day to multi-day adventures
  • Versatile mounting works with any rigid seatpost
  • 11L capacity is enough room for overnights and commutes alike
  • Compatibility with most dry bags makes it easy to customize packing system
  • Not recommended for carbon seatposts
  • Item #BLB001O
11L (671cu in)
Number Included
most standard dry-bags
420 x 152 x 203mm
Claimed Weight
5.3oz (150g)
Manufacturer Warranty

Overall Rating

2.5 based on 2 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 1 reviews
5 Stars - 0 reviews

Fits Slightly Large

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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1 out of 5 stars

May 31, 2024


I've used it once or twice and have initial impressions

It is immediately clear that this was designed by the same people who give you 8 rubber spacers and a flimsy piece of plastic as a mount for your bike light. Incredibly annoying to try and put on your bike. None of the straps are long enough if you have the bag really full. The bag is only attached to the "mount" by a single piece of velcro. You need to clamp two pieces of aluminum together on your saddle rails in order to put the mount on, but if your saddle has any setback,the clamp will not be flat on the rails, and seems as though it could easily damage any rails, even if they're not carbon. Don't buy this.

parker G

Originally reviewed on

4 out of 5 stars

September 27, 2022

Pretty great

I've put it through the wringer
Size Bought:
11 L
6' 3"

I bought this bag a few months ago and used it for a 4 day mountain bike trip. Our group did 25-45 miles of single track each day (maah daah hey trail was awesome). I kept all my clothes and sleeping gear in here and had no problem with space. I really liked being able to take out the dry bag both for packing and also setting up camp. It did make things just a bit easier. Only complaints were that the bag did swing quite a bit. It was less annoying than I would have expected. NOTE to shorter riders this bag does not have anything firm on the bottom and did bulge out a bit. I am pretty tall and run a tall seat so had no tire drag issues but others may struggle with this. Overall I really liked the bag and would recommend to anyone trying out bike packing.

James S