In using a guitar amp, it's important to know how to manipulate the amplifier to achieve a number of different effects, including a clean or dirty sound. Learn about using the bass and treble knobs on an amp with help from a professional guitarist in this free video on guitar amps.
A 10 X 13 envelope (must be less than 1/4 inch thick) is considered a flat and costs 80 cents for the first ounce and 17 cents for each fractional ounce after that up to 13 ounces.
Postage Rates. The least expensive priority mail flat rate envelopes are $5.75. These range in size from 5 x 10 up to 12-1/2 x 9-1/2. By comparison, sending a 12-1/2 x 9-1/2 priority envelope that weighs five pounds would cost $21.55 instead of the flat rate of $5.75. When mailing items over 13 ounces, flat rate options will save you money over the cost of first class mail.