I've used it on a 3-day bikepacking trip and was impressed with its performance. No sagging or loosening after riding singletrack all day long. I didn't notice it hanging off my saddle while flying down mountains. The air purge was useful and I like how rigid the interface is with the seatpost. It's expensive, but it works.
Waterproof! Built very solidly and with outstanding materials that should last for many years to come. Very spacious, yet fits on to a seat post with a mirror 5.5 inches of clearance. Use it for a bikepacking, or simply keep it on your bike for rides where you may need to store your jacket, tools, spare inner-tubes, snackfoods, extra energy,/electrolyte drinks, or anything else for that matter. I am using this for bike packing, touring, as well as commuting.
Great waterproof large seat bag. Attaches easy to bike. Like the valve to let air out of the bag. Like the bungi cords on the top of the bag. Well designed bag. I have taken bag on two day rides and bag has performed to expectations. Thanks Ortlieb!!!'
It took me some time to install it properly as I have an older TREK carbon frame with a horizontal bar and therefore less room under the saddle to secure a bag. But it did work in the end.
The bad is light weight and contains a lot. I can put overnight clothing in there
It is also completely waterproof which was very useful on several occasions.
Also this store gave me a nice price on it as I saw it costs significantly more on amazon.
Well worth it!
I have the Pika and the Outpost to compare this to, and the Ortlieb beats them both. Those are $120 and $99 respectively, however I really do think you get your money's worth if you spend a little extra and get this one. All straps, buckles, and the bag body are very high quality. The air valve is extremely well designed, I hope ortlieb starts to include these on all their waterproof touring bags. I've used it on one short two week tour right before the cold season hit and it worked beautifully. At first I used it solely for my clothing, but unless the clothes are packed down very tight the bag sometimes gets floppy. I'm a lazy packer, so I started to put my tentpoles in along with the clothes and that helped the bag keep its shape better. Ortlieb seat pack and two back rollers on front pannier racks should give you plenty of space for touring through countries like the US, Canada, Japan, etc.
this is a great piece of kit, but more expensive than similar items. I had to buy this one though as it is the one requiring the least distance saddle to tyre clearance. Really worth taking your bike to the shop to try them for size before deciding. Also great that it is waterproof as many others are not. The staff were really helpful with accommodating this.