I bought the Pika due to space restrictions on my 16 Surly Ogre. I have a Revelate Terrapin that I use on other bikes, so I am no stranger to the quality that Revelate brings to the table. The pack is well made with quality fabric. While being considerably smaller than the Terrapin, it still fits a tent with rain fly, sleeping bag and pillow easily. I did not notice any of the sway attributed with larger rear seat packs. In fact, I hardly notice it back there at all! The only thing I would like to see added, would be some webbing at the 4 attatchment points on the top of the pack. I remedied this myself with a quick trip to the fabric store.
I ride a size small bike and use this primarily on my fat bike in the winter but have also used this on my road bike for randonneuring rides when you are riding long distances that are self-supported. The quality is great and after a couple of years use, I have not had any issues. I live in Anchorage, where Revelate was born and have many friends who use a lot of Revelate products on several different bikes. You will find Revelate products on bikes in the winter endurance races (ITI, Susitna 100 and White Mountains 100) as well as locals using them on their bikes all over the world (Holy Land MTN race, Africa, Baja Divide to Arizona Trail, etc.) Very durable and great for everyday use to month's long trip. I highly recommend the Revelate Design products. And this bag is perfect for the smaller rider who cannot utilize the larger version of this bag.
Love this product. I use it for self-supported endurance bike races ranging from 124 miles to 250 miles. Durable. Looks good. Holds a lot while being more compact than similar seat bags. When the bag is full, you may get some side-to-side sway, but if the bag is properly cinched down, the sway in minimal.