Just a simple reminder from a package sorter at UPS.
MORE PADDING & TAPE
The shift (4 hours) I work on handles about 120k packages a night (close to 180k/night this time of year) in a building designed to handle 100k. This means many more packages fighting against one another to get through the system. Jams are a regular occurrence and are not a problem if the box has enough padding to fill the airspace to curtail crushing and enough tape to hold the box shut.
Also, use new or like-new boxes. They hold up to the stresses and strains much better than a box as floppy as a piece of tissue paper.
Your package will get tossed around; dropped, smashed, and everything in-between. Loaders do not have time to place all the heavy and/or large boxes near the floor, or all the small/light boxes near the top of the trailer. A 60lb. box will go on top of a 5lb. box just fine. This usually ends with the 60lb. box denting, crushing, flat out obliterating the 5lb. box as well as allowing the 60lb. one a greater chance of falling to the floor and tearing itself open once the trailer is unloaded.
Unloaders don't have the pleasure of working slow either. They simply do not have the time to make sure "This Side Up" is actually up or enough time to treat the glass table top being shipped like a newborn child. The only packages that get any type of special treatment are Haz-Mat packages. Even then it isn't a whole lot of extra care.
Onto the sorting stage of the process. Each package will go through a couple different sorting stages, but the same thing happens. A sorter is expected to be able to sort roughly 1300 packages an hour. If you do the math, that comes to 2.8 seconds per package. In that 2.8 seconds the sorter must grab the package, find the small zip code on the address label, decide the proper conveyer belt to sort it to (1 of about 12 possibilities, foot level, waist level, or shoulder level), and finally sort the package. Not a whole lot of time to take care of the package.
That is the process for just one stop along the line. Most packages will go through that several times before getting to you.