Flight bag by Carhartt WIP, Because your pockets can only fit so much, Adjustable strap, Zip-top closure, External pockets, Carhartt WIP logo. More than a century after Hamilton Carhartt established his Detroit business, Carhartt Work In Progress (WIP) launched in London, tailoring its workwear focus for a new audience. Collaborations with the likes of A.P.C. and Vans as well as inspiring figures in music and sport have since followed, making it a go-to for logo tees, hoodies and accessories.