So that is a question of the bag you carry on the back. There are full size delivery bags for door dashers that can hold full sized pizzas and even Sicilian pies. That bike that I showed you can easily retrofit one of those big bags because you can buy an adapter plate that you put on the bottom of the bag that would allow you to snap on and off the bag for deliveries, quick and easily. In addition, they also make cargo bikes, and trikes. You really need to investigate this because many people are doing this. The Velotric is waterproof, and you do not have to worry about rain or snow affecting the electronic ever. People have submerged the batteries and whole bikes for 20 minutes and just dry off the terminals and are good to go. It is called the MIK system of snap on accessories, so depending on the bike you could swap metal baskets, panniers, seats, delivery bags in seconds. Here is most of their line, not all of it.