Check out this DIY video on Shipping with the US Postal Service, How to Calculate USPS Shipping Price. These are excellent shipping labels. I have been using these for years and am very happy with them. Absolutely zero issues, you get what you pay for!   

pro label
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This is my go to for 2″ clear packaging tape, have been using it for years with great success. I like to buy in bulk and save money so I opt for the 36 roll deal. This seller does have other options if you don’t want or need a large quantity of packing tape.