Here's a handy little object for the camping season. Lifesystems®' new Glow marker (£5) is for attaching to anything you want to be able to locate easily in the dark- be it the zipper of your tent door, your electronic devices or your water bottle inside the tent. Using photo-luminescent technology, leaving it outside in the sunlight for 5 minutes during the day to recharge will create a glow that lasts up to 12 hours. It has a rechargeable life of up to 10 years and is supplied with a cable-ring attachment to secure it to a wide range of objects.