Using toe straps? I use cheap material ones that come with plastic toe clips - one on either side is really secure, just roll the jacket so it sticks out 4-5 inches either side. Have done this loads with all sorts of clothing - I like not putting a wet jacket back in the bag.
The straps also work for carrying the bag when off the bike.
Hmm fair point about wet things. Probably a bad idea. I'm using leather Christophe toe straps,so maybe they're a bit less grippy in this application. I've got some fabric ones knocking about and will give it a go, cheers.
Using toe straps? I use cheap material ones that come with plastic toe clips - one on either side is really secure, just roll the jacket so it sticks out 4-5 inches either side. Have done this loads with all sorts of clothing - I like not putting a wet jacket back in the bag.
The straps also work for carrying the bag when off the bike.