Originally Posted by
Shadco
Looking a Back Roller single 20L for starters.
Also Vaude since the mounts on the bike were designed with those in mind.
.
You said moderate size. I consider the Back Roller on the large size. The Sport Packer is more moderate size with Sport Roller 15 % less but not small. Unless she needs something to hold a large laptop I’d go for smaller. I have a Back Packer plus, Sport Roller and Sport Packer Plus. Two full large panniers is a very heavy load. I started using double lower hooks with the big bags and off road use.