Customers don’t always buy tonnes of things in one go, though. It’s common for people to spend an afternoon shopping and just buy a few things. If everyone gets in their cars to drive to the store to pick up a few things, there will be a lot more pollution generated than if it was all delivered by a big truck. Especially if those people live in a suburb that’s far from any shopping centers.

Unless you’re using an instant-courier type service (i.e. uber/doordash), goods are usually delivered as part of a regular route by the delivery driver. Your USB pen is only one of hundreds of packages being delivered by that driver, and that driver will be following a fairly consistent route each day. I’d say it’s about as efficient as taking public transit to the store