More importantly, at Men’s Health, we have a whole fashion closet dedicated to calling in, trying out, and selecting the best as well as the newest products. We put them on ourselves to see how the items look and feel before making our final decision. And we constantly go into the fashion closet to feel a product’s materials and test it. Durability: The best sling bags for men will come in durable materials that can withstand everyday use and even outdoor activities. Materials like high-quality nylon, polyester, or leather will help extend a sling bag’s lifespan because these materials' are great at resisting daily wear and tear. Also, pay attention to the stitching and construction of the sling bag to ensure it is sturdy.