I have used a Revelate one, owned a bikepack EU one and now have the Wildcat one
I much prefer the Wildcat….i’ll try to explain why
None of the seat bags are waterproof so you still need the dry bag.
This makes the wildcat lighter
( Weights….. Wildcat 172g + dry bag vs the bikepack EU. @ 372g + drybag )
if it is muddy the seatpack acts as a large mudguard and ends up filthy.
With the Wildcat you can just unclip the harness and slip out the drybag leaving the harness on the bike. You wipe the mud off on the wet grass and finish with a cloth. You can then take a nice clean bag into your tent / tarp.
In the morning you slacken the compression straps on the Wildcat, slip the drybag in and then compress it into a small stable package. Easy and quick.
With the fully enclosed seatpacks it is much more difficult to stuff your drybag in. My mate and i both found it necessary to take the seatpack off the bike in order to get the drybag in. It took far more time and you end up covered in mud
The only slight concern of the Wildcat approach is the vulnerability of your dry bag to being punctured when passing thorn bushes.
I have found the stabilty of each bag pretty good. Id give the Wildcat 9/10, The revelate 8/10 and the Bikepack 7/10 for stability
Hope this helps
