Sewer Hoses

The Frugal Choice:        Camco 4-in-1

Camco is a commonly relied upon brand in RVing, so this should work fine.

Your First Upgrade:        Valterra Dominator

23 mil, which is thicker walls than most.  Specified for -20 to 150 degrees, so they're using good quality material too.

The Savvy Sweet Setup:        Valtera 20-foot Viper

26 mil.  20 feet of hose.  Stays flexible down to -30.