Imagine you are on a raft and you're swimming towards a deserted island. Luckily you have a backpack with a few necessary items for survival. Suddenly your raft starts to sink. You need to get rid of five out of the ten items listed below. Which one would you choose and why?
Box of matches, Water repellent jacket, Hammock, Sunscreen, Box of sardines, Mirror, Cell phone, Encyclopedia, Flip flops, Knife