
Purchased the medium size bag about 6 weeks ago and used it on at least 4, 100 - 140-mile road rides, (plus shorter rides) around Tucson AZ. Easily holds 5 energy chew bags, cell phone and a snack size sandwich bag for stashing cash and a small Allen wrench tool. The outside pouches are nice to store empty energy chew bags. The topside of the top tube on my bike is flat and over 1.5" wide, so the bag sits securely and without movement once strapped to the tube (a round top tube might have different results). The double zippers are a convenient feature allowing quick and easy access to either end of the bag. Overall, really satisfied!!!!

Holds everything you need for road riding. Secure once installed but I feel like I have to tighten it down occasionally, maybe because it's still new or maybe because it loosens on its own. Not easy to move from bike to bike. Not super easy to get things out once installed. It does seem highly durable and well made.
It's sleek enough for my roadie sensibilities.
For what it's worth, in +30 years of being a 'roadie', I'm not sure I've ever found a saddle bag that I would call great. But I can't bring myself to call this one great either and it's quite pricy.

This bag is awesome! Flap definitely stays shut on rough gravel/dirt tracks. It opens and secures easily. It is wide, and there is slight brushing with the legs when standing, but I no longer notice it. I carry iPhone 15, billfold, and many snacks in it. When stopping for coffee or breakfast, it goes in with me. Uses an excellent quick attachment system. Lots of thought and planning, and typical German first class manufacturing are apparent.

Mounts easily onto my Salsa Journeyer using the given bolt spacing and the bag length is perfect for wrapping around the stem. I took a star off because of difficult packaging of the instructions to the bungee strap and no bolts to mount the bag. The bag is made of soft material, so I could see someone over stuffing it and possibly causing knee issues if the bag bulges out. Although I have a 60 cm long wheel base bike so it is not an issue for me as my knees come up near the end of the bag. The bag width is about the same as my top tube, which is what I expected. Just enough for my carrying purposes (bars, suntan lotion, day-use stuff).