Yes MEXICOWANDERER, those screwcap bottles have a narrower neck than the old style. Not a problem except for the fact that one needs a smaller hand pump to cover the neck tightly. Just have both, they're inexpensive devices and a very good design. I also carry more solid plastic caps that fit over the larger neck sizes in such a way one can carry them by the handle, horizonally, without spilling a drop. These are not like the caps that arrive with the bottles from the truck or bottling plant. Makes the screw cap irrelevant.