I don't think you can ship them first class in US- First class must be under 13 oz., and I've never seen a pair of pants that weighed less than that...
I just want to clarify something about this listing. First, is this a relist? I was watching an auction with pants that look just like this but thought they had been sold? But I wanted to make sure- they look like rust colored jeans, but are listed as twill pants. Are they slacks or jeans? How much do they weigh? AND finally, how much is shipping to 66720 zip code?