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Yeah it's great. For the price.
It's more fiddly and takes a few more moments to secure but it can be secured so it doesn't move.
My mate was using it on our trip from Istanbul>Croatia.
We managed to secure a srap from the drybag closure through the saddle (Romin with cutout) through the cutout. This pulled the end of the bag into the saddle tight and it didn't more at all. Zip tie through bag around seatpost. Fastner strap around middle and through saddle rails. Due to strapping it like that it moved bugger all, even when standing. So was good bag.
We used a sea2summit dry bag inside and then just pulled that drybag out and pushed it back in, as bag was attached with zip tie.
This one? Have you used it on its own? the blurb talks about limitations...
@Gaston_Fr buy it direct form the the link above.