I would be a little careful when zipping it up & not overload the pack but yes the 40 oz fits.

My wallet is wide open.

http://twitter.com/tombihn/status/323878656743194625/photo/1

Utilizing the new utility strap, 3 snaphooks are reduced down to 1. 5-7 can fit on a single split ring on the end of a modified key strap. Plum & Wasabi Dyneema are my new favorite color combo BTW....

Dyneema Sidekick and Snake Charmer love-child organizer pouch to hook between to O-rings in the Synapse or via Annex clips to SA or BB.

Brain cell or tweaked cache to mount an iPad mini...

Davek Traveller Umbrellas. Pricey (US$ 90) but pack up to about 9" and are extremely durable.

And fits perfectly in the two inner rear pockets of the CoPilot and the small inside pocket of the Smart Alec! TB design genius evidently or iPad mini designers are fans of TB bags!

EDC bag dump... maybe one of these days I will get around taking pics to all the items shrouded in Dyneema.

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After a little more digging I found this:

Civilian Labs Ghost Ring Bottle Holder

Civilian Lab_ Progressive Packs, Bags & Gear


http://www.civilianlab.com/ghost_ring/ghost_ring_cu001.jpg

Sea to Summit makes Ultra-Sil ones that are light & packable:
Sea to Summit - Outdoor, Travel and Backpacking Gear

Size small would fit the Brain Bag I am guessing. I have a bunch of stuff sacks...

Never tried it myself but maybe attach some sort of bottle sling like the Chicobags ones here:

http://www.chicobag.com/category/bottle-sling-repete


There are lots of neoprene bottle holders...

Attached are photos of my Synapse & CoPilot with reflective green zipper pulls.... CoPilot with TB pulls & Synapse with knots found here:
...

Here is an example of my zipper pull on the Co-Pilot.
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