black crossbody bag, also known as a sling bag or messenger bag, with an adjustable strap and multiple compartments.

Explanation:
Design: The bag features a main compartment and additional zippered pockets on the front, typical for organizing essentials like phones, wallets, or documents.

Strap: It has a long, adjustable shoulder strap designed to be worn across the body, distributing weight and offering hands-free convenience.

Material and Use: Crossbody bags are commonly made from durable materials like polyester or PU leather and are suitable for various uses, including daily commutes, travel, or casual outings. The bag in the image appears to be made of a water-resistant material, common in such bags..