How is the double strap under the straps of a hydration pack? I can't stand lumps and bumps under the straps or under the pack itself. And, the one and only front zipper bra I have takes 4 hands to squish, tuck and zip . Funny, how there always seems to be a volunteer in the house. Ok, back to G-rated conversation. How 'bout the comfort of them 'ther double straps under a heavy pack?