Avery offers 2" x 4" repositionable shipping labels for laser and inkjet printers.
You can design these using the 5163 template in Avery Design & Print Online.
You can also use a template built into Microsoft Word or download an Avery 5163 template for Word, Photoshop, Illustrator, InDesign or Pages.
Here's some information on recommended printer settings.
If you want more information about a specific Avery label, search for the product number on avery.com.