One other option is a slosher tray. It divides the tray into 4 compartments that each take 1 4x5 negative. I've had very good luck with a slosher tray for 4x5 negatives and I will be using one for 8x10 starting next month. You can see the 4x5 negative version at http://www.summitek.com/cradle.html
Photographers Formulary also sells both the 4x5 negative and 8x10 negative versions.