I got a new WB Traveler and it doesn't have a ridgeline organizer. I have some of the smallest Nite Ize S-biners (size 0) and I just hooked the stuff sack on the ridgeline with that. It hangs down too far, so I just threw it over the side, behind my head. Works fine for my radio, phone and glasses.
Those little s-biners are great for attaching UQ suspensions too. They are tougher than you would think.