The only service commitment is Next Day Air. All other services do not qualify. More on reddit.com

Small items should go through USPS better, UPS does charge a lot for small things but that seems like crazy expensive as well. Did they mess up the weight? More on reddit.com

It comes down to planning. Think about having to deliver 100 packages in your city with 10 trucks. That means you have to figure out the best way to pack a bunch of trucks and assign a route to them. You want to use the least fuel, and you can't deliver outside certain hours. That's already a really tough problem. If something has to get from A to B in 24 hours, there are only a few planes and a few trucks it could possibly be on to do so. If the plane's not really "full" then tough, the shipper has to fly it anyway. There might not be many deliveries in the neighborhood, but it doesn't matter, a truck is going to have to go to it anyway. On the other hand, if a person has paid less for "slower" shipping, then the route planning is easier. If the planes at the source aren't very full on the first day, the company can wait an extra day or two to conserve fuel. If there aren't many packages headed to that neighborhood when it arrives near the destination, the company can wait an extra day or two until other packages are due to conserve fuel and driver time. That's why Amazon offers incentives to hold your packages for "Amazon day". If everyone near you agrees to let their purchases bundle up and ship on only one day, Amazon will need fewer drivers and less fuel to make those deliveries than if everybody asks for their package ASAP. When we're talking millions of deliveries, those costs add up! So TL;DR: The longer you give a shipping company to deliver a package, the more they can cut the fuel and driver time costs they need to deliver it. It doesn't cost them much to keep the box sitting in a warehouse, but it DOES cost them a lot if a driver has to go 10 minutes out of their way for 1 delivery or if a truck leaves the distribution center without a full load. Faster shipping covers these losses by charging more. More on reddit.com

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