Perfect for lightweight bikepacking trips on bikes with low tire clearance, the updated 8-liter Revelate Designs Terrapin System seat pack combines a mount and dry bag for modular waterproof storage.
R E I Staff PickSTAFF PICK
Tested and loved by REI staff
“When I embarked on my first bikepacking trip in 2024, I needed something roomy, lightweight, and remarkably waterproof to hold essential gear. This seat pack was a perfect companion through 300+ miles of rain and mixed terrain.”
Cooper
REI Staff - Iowa
Biking since 2010
Features
Indie-Rail attachment system tightly cinches down to each saddle rail to eliminate side-to-side bag sway, providing a stable mount without any extra hardware
Dry bag features RF-welded waterproof construction to keep your gear dry; 1-way air purge valve rids bag of excess air while maintaining a low profile inside the bag
Dry bag not intended for prolonged submersion
X-Pac fabric panels are twice as abrasion resistant as standard VX material, increasing the mount's durability
External webbing and bungee offer additional easy-access storage
Composite internal topsheet provides a solid and stable platform for the strap points and transmits the vertical load to the seatpost connection
Mount is stiffened on all sides and includes an external plastic bottom framesheet that protects the bottom of the bag like a fender
System is compatible with carbon seatposts
Terrapin mount weighs 369 g (13 oz.); dry bag weighs 113 g (4 oz.)
Note: It's important to check tire clearance prior to use, as contact with your tire can cause a wreck; Revelate specifies 7 in. minimum tire clearance from saddle rails
Adding a review will require a valid email for verification
Customer Images
Ponch
Age:45–54
Rated 5.0 out of 5 stars
3 years ago
Excellent for bike commuting
Yes , I recommend this product
Use this bag to carry work clothes for bike commutes. Used it for several years with no issues. It is easy to install, super stable, switches easily from bike to bike, and no visible wear on carbon seatpost.
Age:45–54
Helpful?
Tom Maurer
Location:Sidney BC
Age:55–64
Rated 5.0 out of 5 stars
5 years ago
Revelates best saddle bag for a dropper post
Yes , I recommend this product
This is by far the best saddle bag I've used, and I've got 4 of them. It's solid, no swinging and it works well with a dropper post so long as you install a restriction collar to prevent the post from dropping It's maximum. I love all my Revelate bags!
Age:55–64
Helpful?
DanT
Location:Montana
Age:45–54
Rated 5.0 out of 5 stars
3 years ago
Works Great
Yes , I recommend this product
If packed correct, and installed right, the bag doesn't shift or move. It is easy to install and remove. Like all my Revelate bags, it just works great.
Age:45–54
Helpful?
Anonymous
Rated 5.0 out of 5 stars
4 years ago
Helpful?
Questions & Answers
Loading Questions...
Need help choosing gear?
Get real advice from our experts who have been there, done that.
10% co-op member reward: $20 $20 Member Reward
Your NameLIFETIME MEMBER#0123456
This purchase pays for membership!
Buy a lifetime $30 membership and make a $50 purchase by Nov 12, 2026.*