The SLP2 Survival Tool. Proof, yet again, that nail files are not the only thing that’ll get you kicked off a flight. £34.99.
As well as its sturdy little black and serrated locking ‘A’ grade blade, it comes with a remarkable firesteel (developed by the small, but, no doubt, perfectly formed, Swedish Defense Department) which will light fires with ease even in the wet – it produces an astonishing 3,000°C hot spark. The handle of the firesteel contains a small but powerful waterproof torch, and in the body of the SL2 is a piercing rescue whistle, as well as a handy belt clip.