i think it could work right? you're not going to walk miles with it?
I dont think it would stick in your back, the metal frame on that rucksack would spread the weight over your back more, and as long as you have nice padded straps and that belt to go around your waist for support, you should be good.
as long as the frame doesnt brake.
half the problem with carrying amps in your arms, i think, is the shape of them. its really hard to get a comfortable hold on them. also, the weight distribution can make it hard.
i know my uber is awkward to carry because the trannies are at one side, where as my Avenger is much more balanced.