When you turn 80, you want to share the milestone with your friends. So octogenarian bag maker Porter invited Stone Island to celebrate by trussing up its archive, with the pair crafting a set of bags that marry Japanese design flair with Italian textile nous. Meaning you get an accessory as impervious to fashion’s fluctuations as the weather.

This time around, Porter’s Helmet backpack, messenger bag and holdall have been reworked in a metallic polyurethane resin-coated cotton that adds an eye-catching shimmer. It’s also durable enough to withstand any eager fingers, ensuring your belongings stay safe should the birthday party descend into an impromptu game of pass the parcel.

Each piece comes with Porter’s practical features as standard, including grab handles, capacious pockets and inner compartments, finished with both labels’ branding. And as you’d expect from companies with such technical heritage, all three bags are durable but still lightweight, so they’ll take you from office to gym to weekend getaway.

The full Porter x Stone Island 80th Anniversary capsule collection is available now at Flannels, priced from £295.

Porter x Stone Island 80th Anniversary Collection