Do you mean, as shipped? Just a neck? If so, what kind? Any tuners?
The heaviest neck I've ever had was 2lbs. all up (Ebony over Bloodwood, Pro version), so it would probably ship as 3lbs. in a box that UPS would measure as 6"x6"x31"
I've got an all Rosewood Pro neck already packed/boxed w/ tuners that weighs 2.5lbs, same dimensions, so that would probably go as 3lbs., too. Same with a an Ebony over Pau Ferro neck.
Standard Strat necks are usually lighter, as they're usually just Rosewood over Maple, single truss rod, beer can tuners. They may package up to 2lbs.