San-Francisco’s WaterField Designs engaged over 700 customers to collaborate on the design of the new Hip Sling Bags, sleek, contemporary takes on the traditional waist pack with interchangeable straps so users can wear them belt-bag style or over either shoulder as a fashionable sling. A plush-lined pocket stores eyeglasses, double zippers allow multi-angle access, and an innovative strap system fastens with a self-finding magnetic Fidlock buckle. Full-grain leather with waxed canvas or ballistic nylon satisfies survey participants’ foremost desire for a professional look, and three sizes acc…