For those interested in a possible $15 solution for occasional touring or light shopping, I thought I should mention that those sturdy Stansport Canvas Saddle Bags (https://www.stansport.com/saddle-bag-black-canvas-766-20) measure about 35 inches (89 cm) from bottom tip to bottom tip, in case anyone wants to check if they'll clear the pipes if slung over the pillion saddle. They have four grommets for attachment on the cross-strap as well as a pair of D-rings at the bottom of each bag.
I've got a pair of the olive green ones in keeping with my Bullet's whole "Military Thang", but they also come in black, as shown below.
(https://www.stansport.com/content/images/thumbs/0017640_saddle-bag-black-canvas_560.jpeg)
My bike came with a pair of those metal ammo box looking panniers, but I use my Stansports too on longish camping tours, just sort of bungeeing them over my tent and sleeping bag on the rear rack, where they help hold down everything nice and firm. When not in use, they're handy for stowing my smaller camping gear. They're hard to beat for the money, and right now Stansport's offering free shipping with a minimum $50 purchase. It shouldn't be much of a challenge to make that nut if you're a gear junkie like me. If nothing else, everyone can use another duffel bag, right?