The Xinglet is a very effective visibility accessory, which Amphipod makes in two versions - the original Xinglet and the more versatile Xinglet Pocket. Both are a simple belt and suspenders design that appeals to runners who may not be very excited about a full vest.
The front yoke of the Xinglet Pocket features a zippered pocket for small items. The nearly unobtrusive feel and very quick addition as you head out the door - pull it overhead and clip the waistband of the adjustable bottom straps, and you are good to go. The modest price, ease of use, and high visibility appeal to runners, and their loved ones - who are pretty excited about avoiding runner/motorist collisions.