If you travel frequently, you're probably lugging around a clunky array of backup batteries for all your wireless gizmos. Soon you'll be able to lighten your load with Medis Technologies´s new nine-ounce disposable Power Pack. When your iPod dies mid-flight, you can plug it in for a full on-the-spot recharge. The 1.3-watt device will do this five times. It will also deliver five full charges for your digital camera or 20 hours of talk time for your cellphone before it's spent. All told, Medis says, it'll last 15 times as long as other portable rechargers on the market.