i would say go for for the mid side ones because if you really need to carry any more than this you can at least carry the extra stuff on the rear seat which should really only be a few extras.
But have you even considered the size of what 45ltr panniers look like and the amount of stuff you can get into them. My dads got 2 givi 45ltr panniers and they are huge, i once took a long weekend trip away with a mate and i could carry mine and my mates stuff + sleeping bags and inflating mats, the only thing that didnt fit was the tent, just too long. and even then i still had a few litres extra after the weekend was over.
i would also say get a box of some sort and work out the size/amount of litres it holds see what you can pack into it, then you have some sort of base to play with so you should know that that amount of stuff only takes up X amount of litres.
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