They're very similar—a fanny pack is usually worn around the waist like a belt while a sling bag lays higher across the shoulder and chest. Both offer hands-free comfort, just at different sizes.

Bellroy designed a fanny pack-like bag that's stylish, versatile, and surprisingly spacious — and it's called the Sling. The Bellroy Sling is a unisex bag that can be worn across your chest ...