Marmot only makes down bags with one side zip. I'm trying to find a bag to mate to a Phase 20 so my wife and I can zip bags together.

I've seen Feathered Friends uses the YKK #5. Does anyone know what the marmot phase 20 uses?

http://www.marmot.com/phase-20/23330...-bags#start=1\

Thanks!

I'm trying to figure out which bags might be compatible.