They still have them with the threaded vents

http://www.earthquakesupplycenter.com/aquatainersevengal.htm

Did you happen to buy them from Walmart? I notice Walmart items sometimes has minor differences on their stuff compared to other stores.

There's always the coleman water containers

http://www.coleman.com/coleman/colemancom/detail.asp?product_id=5620B718G&categoryid=8510

Haven't tried it, but they seem a little more durable than the aquatainers. Unfortunately, I haven't found anything that is as cost effective as the aquatainers. Don't bother with the green Reliance Desert patrol water containers, I've heard nothing but bad things about them.