Madewell Essentials Sling Bag $148 Retail This sling bag has an adjustable strap (AKA it can be worn multiple ways) and plenty of room to hold your water bottle, wallet, keys and other necessities (there's even an interior slip pocket for easy access your phone). It's so good, it's Essential. 100% leather Zip closure Interior pocket Attached adjustable strap Condition: The leather on the strap has some cracks, and there’s a small crack on the bottom corner. Otherwise, the bag is in good used condition.