I've had a G4 for years, but it's a bit small for winter camping. I roll up a CCF and stick it vertically into the pack (what can I say? Old age caught up and now I need 2 pads underneath to stay warm on a cool night.) and that takes up quite a bit of room.
Anyway, GVP's site says the G4 has 2800ci in the body, and the Mariposa has 3700ci. That's a HUGE difference. Is the Mariposa taller, have larger diameter, or what? Can somebody with both pack comment please.