There are at least 5 different courier companies in the Seattle metro area. Courts still require paper documentation (wet signature), lots of places still cut paper checks for payments, prototype devices/equipment, large-format drawings (architectural, etc.), print materials for distribution, any non-information deliverable...

I rode back in the early 90s and I used to haul a lot of blueprints, photo proofs, physical checks, and electronics repair parts. One of the strangest was a sawzall (pickup at the tool shop, drop off at work site; apparently they broke the only one they had) the bulkiest was 10 blueprint tubes (4" x 60").