Does the Marmot Pinnacle stow away at the...
Does the Marmot Pinnacle stow away at the same size
as the Helium (7.5 X 15")?
Just about, it's only incrementally less compressible. With a 7.5x15, the pinnacle will simply be a little tighter and harder to stuff than the helium. The two bags are very similar, different fabrics and the Helium doesn't have a draft collar.