Hallo,BerlinMatt wrote: ↑7 Mar 2023, 1:16pm The Block needs to be tight to the seatpost. When I've used mine with small diameter seatposts I've had to put a shim made of old innertube between the bands and the post. What's the diameter of your seatpost? Might also be worth checking that carradice didn't send you the larger sized bands by mistake.
I think it's a great system and have used it with their largest bags for touring and on really horrible roads without issues.
The block is good and tight, but there is a tad too much play between the block and the frame rails so can wobble a bit much.
Seatpost is a bog standard 27.2.
Cheers