those backpacks look super sweet!
i currently carry all my gear in a
gregory miwok 18. it pretty easily handles my
trail boss (which if you haven't seen this, it's super awesome - i highly recommend) with two different heads, and all three silky saws, hydration, etc...even the katanaboy! that said, i only tote the katanaboy when i know there's something large enough that i want to take out. it's not an every ride sort of thing!
i've had the dewalt 16" electric chain in my hands on just about every home depot trip that i've made recently...but i just sort of like the idea of "analog" trail maintenance...at least for now. talk to me again in a year!