Top positive review
Yes, it can be used with a (small) seatbag
Reviewed in the United States on June 7, 2019
Other reviewers have noted that the machining and overall quality on this mount are excellent. They are. It is a solid product. Others have noted, too, that it doesn't work with all saddles. I can understand that too, but the fact that the quarter-turn mounting plate can swivel up or down is important. If you can get the little brackets to fit on your seat rails, you can make the light work. What you can't do is attach this mount to your saddle, then expect to put a rucksack-sized seat pack down there. The attached photo shows the mount with the Varia radar light attached to a Bontrager Nebula saddle, and a Bontrager Elite Small Seat Pack (fully loaded) mounted in front. This setup works well if you are using your seat bag only for "emergency" items, and don't have to access it frequently. That suits me fine, as the mount keeps my $200 taillight secure.