A little known storage area is located in the NJ Transit/ Amtrak area of Penn Station.

My out of town friend utilzed it yesterday and it was fanatastic.

She had approximately 8 hours between arriving in New York on a cruise ship and having to get to airport in time to check in & clear security on a departing flight home.

There is a flat 24 hour fee you can store up to 3 parcels/luggage per person; but the convenience and ability to use the time to go shopping & wandering around NYC the $3.50 per item charge was nominal.