How to pack safely
For shorter distances it will usually be sufficient to put your goods in a box or envelope.
For longer distances, however, you do need to think of a few things to ensure that your goods arrive in the condition you sent them.
soft at the centre
Use something soft and springy to wrap around the item. Bubble wrap or newspaper are good choices. Liquid contents need to be wrapped in something that can absorb leakages.
A hard shell
Place the item in a hard outer box that can handle shock and pressure from other packages. Corrugated cartons are a good choice. Avoid pointy parts that may get stuck and cause damage. Consider the weight of your item and choose an appropriate type of box.
Fill your box with some distance material between your soft wrap and the hard shell. This will prevent the goods from rattling around during transport. Bubble wrap or newspaper work well. Turn the package upside-down to check that the content is stable inside the box.