Of all the things that you need to stock up on, if you're the avid boating, rafting sort of person, it's the Water Buoy. Rescuing important stuff like keys, phones, and the likes (tackles up to 1 Kg with ease) this an important gadget that you need with you on your next fishing trip. It inflates when it's submerged and has a blinking LED that lasts 24 hours. It costs 30,00 € ($47)here.