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Evertything is sqround so it's hard to give a diameter but the red top should fit in a 10cm circle, without you should be able to fit it in a 9cm ID pot. I don't have calipers, so take these measurements with a grain of salt, but I think it'd sooner be 88mm than 92mm.
I made my bagel bag prototype into a bum bag to find out that @platypus was right, very sweaty back and not very comfortable. I tested it by bringing coffee gear on my ride, comfort might be better with softer and lighter stuff in it but back will still be sweaty.