Comment: Not very large but does expand enough to put a light jacket or with some stuffing a hoodie into. Zippers are kind of stiff and hard to work at first but one you have bag mounted they work okay. The Vinyl covering looks a little on the cheap side. I am impressed by how secure the suction cups seem to attach the bag.
Saddlemen pillion bag Review
Comment: Very well made, zippers are very stiff, seals tightly. Just big enough to hold a folded sweatshirt and gloves. Good for daily commute.