I had purchased a specialized Shiv bladder in Size small. I have the 51cm IA frame and I couldn't get it to fit into the downtime. Perhaps larger sizes allow for more clearance? I'm not sure how we'd confirm that short of having the engineers specs.

I had an entire thread on this last year. There are some links to DIY projects other IA owners have done.

http://forum.slowtwitch.com/...tomization_P5426788/

Unfortunately I wasn't able to get this off the ground but I have a lot of details for the planning, I have the misfortune of being unable to design in CAD or 3D Print things ... yet. Clif Blocks work well in there due to shape. I've also taped gels together and made a "snake" of them. I could get 3 gels in easily and 2 sets of 3 gel snakes if I'm not mistaken.

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"Train so you have no regrets @ the finish line"