Should be no problem. I fit my 15 inch laptop with gripped 5D2 with Zeiss 35/1.4 attached, 35L, 50MP, 70-200 and have room for rocket blower and all those other knick knacks. The laptop have to go to the back and have to perform a little surgery to cut away the little threads making the back compartment into two halves. Quite easy to do so no worries.
Hi, care to share which threads you cut, or a picture of the mbp 15 in the 307. Hoping to do it too.