One for the survivalists out there, the TaskOne is the Swiss Army knife of smartphone cases. This handy accessory features a range of stainless steel tools on a case that offers durability through its part-aluminium design. The set of miniature tools include a knife, saw blade, pliers, wrenches, a screwdriver and a bottle opener, among others. Although the GPS on your smartphone should be enough to get you out of a sticky situation in the wild, it’s nice to have some extra tools attached to your phone case for your camping trip. Price: £63 • You may also like the latest impossibly slim waterproof sony xperia z3 compact android tablet.