Here's the situation... how would you safely carry a modest amount of shopping on your retro-styled scooter (e.g. Scomadi 125)? I am talking about the amount of shopping that would fit into one carrier bag. I would prefer not to use a rucksack due to the weight being up high so am wondering what brand and capacity of tunnel bags people use and how they anchor them safely. Can you get stick-on hooks/rings that a bungee or two would hook into to secure a tunnel bag? In this situation I have a waterproof insulated roll-top bag that is tall rather than broad. I used it for transporting milk on my bicycle in the summer as it fitted into a pannier. Now, having brought your modest amount of shopping back safely, how would you handle needing to bring back more? How effective are the double panniers that I have seen? Do they scratch the side panels? How do they tend to anchor securely to the scooter? What brands are popular?
Rucksacks can be adjustable for weight distribution - i have a large capacity camper with an unzippable base extension. For larger loads,i tend to use a large vinyl /canvas laundry bag on the floorboards - bungee cords are always a good carry as well.
Rucksack. I didnt have a car licence til last year, you would be amazed at what you can get on a bike. Its just like tetris, only real life...
But bicycle panniers are a good cheap option too. You just have to be creative with your packing. My bmw has a wheelchair mounting bracket.
You can adjust the rucksack so it sits on the back of the seat while wearing it, takes the weight off you.
Definitely a rucksack, when you're cruising in a straight line you don't really feel the weight as much, and you get used to it after a few trips, also most scooters/mopeds have a sling hook fitted somewhere under the dash between your legs, so as long as you don't go jumping anywhere, you can easily sling a bag on that, just make sure the bag has decent handles that don't snap on you.
Had a pair of Hein Gerke throw over saddle bags for my SR125 Yamaha - fitted on my Nsc110 brilliantly.!.
If your worried about scratching with panniers sew on some old rubber car mats to the back works a treat! I use a combo of rucksack panniers and a bunjee cargo net that i hook onto the edges of the seat.