Grey Checkered Lunch Bag

Insulated Lunch Bag/Cooler Bag.

Blue Bird (indicated by the text on the bag) Likely a fabric exterior with an insulated interior lining (the exact material is not clear from the image).

Features a dark gray and black checkered pattern. Zipper closure at the top. Includes a woven fabric handle for carrying .

A mesh pocket on the side (likely for a water bottle or small items).

Rectangular with a slightly boxy form.

 Lunch bags are commonly used by school and office workers for carrying meals, offering features such as insulation, convenience, and easy cleaning. 

They can keep food fresh and are available in various materials, with plastic options being lightweight and affordable. 

Lunch bags and boxes are also effective at keeping cold meals chilled.