Tropicfeel do backpacks a bit differently. They're all about versatile, adaptable packs – each one forming the core of what they call an 'ecosystem' of specially designed accessories. Take this Shell pack, which you can trim down to a sleek 20-litre daypack or expand up to 42 litres for a weekend break. A special bit of genius is the 6-litre 'kangaroo' pocket that folds out of the bottom and perfectly fits your muddy running shoes. Weatherproof and comfortable with waist and sternum straps, it's stylish enough for the city and rugged enough for the mountains.