I have no profit to gain with Gossamer Gear and I wasn't even looking for a new backpack,
I was trolling their site to price the new sitpad but couldn't pass on this deal:

2017 Gorilla 40 Ultralight Backpack

Their 60 liter Mariposa has been my go to backpack for the past couple of seasons, and I love it, but
it's big ( voluminous ) for the 2 or sometimes 3 night hikes my schedule now affords.

I bit on the '17 Gorilla because it still has a removable "brain", the current model uses the same attached flap
that my Mariposa has, and I kind of don't like.  The flap pocket isn't practical for anything but maps.

I'm hoping the Gorilla will be my adaptable pack.  Naked it's 18 oz.  Add a sitpad for basic support ( 2 oz )
or the frame for more support (3 oz).  Need more volume, add the brain (3 oz). Humping more weight, add a hipbelt (8 oz).

The 2017 Hipbelt Large is on sale too.  

I wish they had female specific packs.

ULA sells packs with female specific shoulder straps.

S straps are also great for guys with big chests. moobs or pecs.