If you go out in the woods tonight

This unique little lid lets your water bottle double as a lantern. The Firefly by Guyot Designs fits on all standard wide-mouth bottles; its small LED light illuminates the entire container. The light level is adjustable, so you can dim it enough to make a softly glowing night light or dial it up high enough to read by. The LED is sealed in a compartment, so it won't be affected by whatever you're drinking, and the device can be used no matter if your water bottle is right side up, upside down, or rolling around on its side. The Firefly costs about $20 and is available at REI stores (800-426-4840, rei.com ), Eastern Mountain Sports stores (888-463-6367, ems.com ), and online at guyotdesigns.com .