Designers seem to love convertible, multifunctional backpacks, as evidenced by designs like the Glyde Gear Fly and WalkBag. They don't mind the occasional convertible jacket, either – just look at the ...

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‘There’s no such thing as bad weather,’ goes the classic (and annoying) quote by British author and fell-walker Alfred Wainwright, ‘only unsuitable clothing.’ Trouble is, Alf, until recently, even ...