In Paris, you will see a lot of uber eats/deliveroo/etc. drivers on bikes and electric mopeds. It reduces their costs by orders of magnitude while not really changing their delivery times (probably shortening them actually. Unrelated to the question, they drive extremely dangerously (because of the way they're paid, they're doing all they can to cut times. do not expect them to stop at red lights))

They have those huge backpacks [1]. Some fasten it like a kind of top-case.

[1]: https://images.app.goo.gl/XVyoMqpQiQFvC5EU8