Anyone have issues with the WF slipping from a luggage handle? My better half finally agreed to a TB bag and she picked the WF to use as her personal item to go with her rolling bag. But it always seems to slip and slide around when she uses it, sometimes with a crash to the ground of both bags. The zipper seems enormously too big and while it's easy to zip/unzip, that leads to the zipper coming open when you want it snugly closed around the rolling bag handle.
Any tips? I'd like to keep her on the TB buying trend if I can.