Incognito/low-profile gear storage?

[emptysea]

I'm with kenny. I have a smallish Nelson Rigg tailbag that straps under the passenger seat. Mine has zipper pulls that can hold a luggage lock, but I don't use it. I just don't keep much of value in there if I'm parking where I can't see the bike.

If you are concerned about theft, though, why not just get a couple of bungee cords (I recommend ROK Straps) or a bungee net and strap down your backpack on the rear seat? Then you can take that with you and just toss the straps in the pack. I do that with my briefcase sometimes when I ride to work.