What a clever idea! A pair of dumbbells that weigh no more than 2 lb and collapse flat in your luggage, but let you maintain your weight training in the privacy of your hotel room when you're on the road. The weight? That comes from the water you add at your destination - up to 30 lbs (15 lbs on each bar) - that empties in seconds when it's time to pack for home. Includes eight "weights" (about up to 3-3/4 lb each, guaranteed not to leak) and two 13"-long knurled bars with soft-cushioned grips. ...more