When you need a convenient bag, the Bellroy Sling Essentials Bag is there. This sling bag is designed with a side gusset to make the most of its space. So when you pack it full, it will expand. And when you aren’t carrying much, it shrinks. Plus, you won’t lose anything in this sling backpack. It has a clip in the main compartment that you can attach your keys to. And it even has a spot for your sunglasses with a soft fabric lining so they won’t get scratched. This sling essentials bag will be comfortable to wear, too, as it’s padded on the back. So no matter what you have inside, you won’t feel it against you as you walk or bike. On top of that, the weather doesn’t matter: this bag is water resistant, so it can handle a bit of rain.