the other day i mailed off a very skinny shoe box with an insulated drinking cup in it at the post office. i had added some plastic bags to keep it from moving around and some cardboard from the back of a writing tablet for a top (I didn't have the shoe box top). it weighed 1.7 ounces and went to Wyoming. the cup cost about $3.00 but mailing it cost $5.70!! too much!!!!