I recently got a bike. It has a back rack, so I can carry bags, which is nice. But the panniers for sale in the bike shops didn’t impress me. Most of them were just one large compartment, which is inconvenient.
I wanted the bag to be large enough to carry my laptop, a change of clothes and shoes. Nothing suited me. So I made my own. Photo fail; it was blurry and sideways and laziness prevents my fixing the situation.
I got a bag at Montana Rescue Mission, bolted tarp hooks and a drawer pull to the back, et voila!
The bungee prevents the bag from flying off the rack. Helpful.