Yeah, but you're vacation money is being borrowed by the government and they're not paying you for it. At least with a savings account, you'd get some kind of interest rate. They do make Vacation Club type programs at banks where you can make deposits through-out the year and then they'll cut you a check around vacation time to use... It's the same thing, but you have access to that money through out the year if you have an emergency, and you're earning a little (i mean very little) interest.
Happy Vacationing!