USPS "click n' ship" does not support letters! You have to subscribe to something like stamps.com at $19.95 a month and that's ridiculous. I just prefer using bubble mailers, the security they provide and the hassle free placing of chips/tokens, postcards and match book covers in them makes the extra expense of them worthwile, I do pass on some of the cost by having soemwhat higher shipping charges. $2.50 rather than $1.50 or $2.00!