We've switched to the "Arm & Hammer" brand called "Clump n Seal" -- comes in a box with a carry handle, slightly resembles a beer can carton.
Fairly pricey but the absolute best litter we've ever used! Because of the excellent clumping, you use less litter between box changes, so the higher price of this litter is somewhat balanced. It is however the most expensive litter we've used, so take note. Sometimes you gotta pay extra to get what you want.