Like a lot of people I use USPS Priority Mail flat rate envelopes and boxes. It's hard to beat the price, free pick-up, 2-3 day service across the US and you can do everything at home. My comment is that USPS insurance is extremely difficult to make a claim on. The claim is made on the receiving end and even when you show up with the damaged envelope or box and pictures of the item before it was sent, the standard line is "well--we don't know what it looked like before it was packaged." USPS also has a year to make a decision on your claim. Of the hundreds of items I've shipped with USPS, only 2 people have made damage claims and both experiences were long and drawn out. USPS insurance is more of a "feel good" service than something that really works. I am curious if UPS is more efficient and fair in processing claims.