At 5” x 1”, the Krill Lamp fits in any pack or pocket. With two AA batteries, it weighs a scant 3 ounces, and will radiate 360 degrees of soft glowing electroluminescent light for up to five days. That’s as long as 15 chemical light sticks which cost 25% more. The durable case and positive on/off switch are waterproof to 150 feet and rated to 3000 hours of lifetime use. The perfect light to hang in a tent. White or blue. 5"x1". 3 oz. 1.7 lumens.