Amazon is hosting yet another Prime Day sale and, for the first time ever, it's running across four days, from Tuesday 8 July until midnight on Friday 11 July.

Prime Day is an excellent time to find steep discounts in the sleep department.

Our top pick for the best classic backpack for college and high school students. An unfussy, functional bag with retro-inspired styling. Extra-roomy. Straps are flexible, nicely padded, and easy to ad...