flexible strap or belt used in the form of a loop to support or raise a hanging weight.suspend or arrange (something), especially with a strap or straps, so that it hangs loosely in a particular position Sling bags are great because they're ergonomically designed, roomy without being excessively large, provide excellent mobility, and make access simple and easy. On the other hand, backpacks are larger, so if you need more gear, they might be the way to go; however, they won't have the same flexibility as sling bags..