Sok It Ice Cream Sok Insulated Neoprene Cover (Midnight Tropics, Tapered Ice Cream Pints)

Q: Will either size fit a Ninja Creami container?

no, i bought the bigger one and it did not fit the ninja creami pints

Q: Would these keep pints frozen inside of a cooler for an hour drive? We like to bring home pints for the dairy.

I doubt it. They are best used as a koozie whilst eating the pint straight after opening it. You should be looking for those double-walled metal coolers with screw-down tops. I have one of those but I never tested its (IIRC) 2-hour frozen claim. (I can say those containers are useless for holding a pint of ice cream whilst eating it; the pint just spins inside the cooler.)

Q: What are the dimensions for the regular vs the tapered?

The regular Ice CreamPintsok fits a standard ice cream pint like B&J or H&D and is tapered. The other is a Talenti ice creamPintSok that only fits Talenti containers- same base diameter as top.