There are many styles of gym duffle bags, such as backpacks, messenger bags, handbags, etc. First of all, you have to make clear what style you like. Generally speaking, men should prefer double shoulders, which are more convenient to carry.
What is a duffle? A duffle bag, is also called as travel bag, luggage bag, gym bag, and it is made of oxford, nyon, polyester and synthetic fabric. People like to used it for travel, sports and recreation by civilians.