Box labels can be printer on a regular printer and placed on the box using clear tape or can be printed on 4x6 labels.  For those wishing to print the labels on self-adhesive labels, you can choose from one of the following printers to accomplish this:

DYMO LabelWriter 4XL

Zebra LP2844 Shipping label printer

When printing via a Laser Printer on 8.5x11 paper, if your label prints the entire size of the sheet, please check your printer settings.  Try changing your page size to 4x6, while still printing on the 8.5x11 inch paper.  See below.