I had some Cameron Barker panniers (see header image). They’re now discontinued and they didn’t work so well on the cruiser, the mounting system probably works better on conventional tourers and adventure bikes but I’ve torn the fabric where the eyelets meet the system due to the bungees pulling at an odd angle. They were very waterproof so top marks for that.
My pannier supports met with an unfortunate incident involving my mother not listening and enthusiastically operating a powered garage door. I sought out a cheap alternative.
I tried a Held Waterproof Tail Carry Bag. The 30 litre option is plenty to supplement my 45 litre topbox. It’s really simple, a red PVC tarpaulin bag will a roll top, some compression straps and a shoulder strap for off the bike. I bought some rok straps to secure it to the pillion seat. They fit in seconds and are far more secure than standard bungees. I’ve been using it since the autumn and it’s not let me down. Really simple. Really waterproof.