Oddly enough, when they came to Rugby I was very tempted to give it a go. I don't need to earn mega bucks but it could be fun riding around the town for a few hours in a day delivering food. The thing that really puts me off is that stupid great box on their back. I would prefer to use panniers and racktop bags.
I think you can put the box on a rack. You'd need to unstrap it every time you delivered and collected, obviously, and you'd need pretty big straps to do so.
you have a choice when you sign up .... either a backpack or a box .... if you want the box, they will fit it onto your rack for free ( you have to have a rack on your bike):
it's big but has been designed to carry several large pizzas... problem is, if you have more than 1 bike, and the 'deliveroo bike' is not working/broken, you cannot work, whereas with the backpack, you can jump onto any bike and earn cash
the backpack is very light and is not a problem to cycle with .... I've yet to get a pizza delivery in Cambridge .... all my jobs have been small sized orders....
you are issued with a smaller bag that fits into the big bag which keeps the food warm/ warmer