Nah, I wouldn't try to stuff an ICU in the MS36L rather, I was looking to modify a travel backpack with an ICU as an alternative to the MS36L.
Ah sorry, I must've misread and connected two thoughts of yours (MS36L, and ICU) together that didn't belong lol.
The Nya Evo XL will certainly do it. I don't have any experience with the Fstop stuff yet.
None of the Shimoda or Peak design ICU's are large enough