The Olympics has set off a restless energy in you. It’s building, rising, unstoppable – yes, you need a new lightweight backpack! (For running to work. And maybe five-a-side.) Our top picks are the featherweight but small Deuter Speed Lite 5 (£34.99), the stealthy 12-litre OMM Phantom 12 (£50), the people’s champion Osprey Talon 18 (£75), or the princely Hoka Evo R (£120) – a lean, mean, stuff-carrying machine.