Polyester School Lunch Bag, Feature : Water Proof, Fine Quality, Elegant Style, Easy Wash, Attractive Looks

A square lunch bag in medium size is a type of bag designed to carry a meal or food items for an individual. It typically has a square-shaped main compartment with enough space to fit a medium-sized lunch box or container, snacks, and a water bottle.

The bag is designed to keep the food fresh and cool for several hours, usually by using insulated materials or lining. It often comes with a sturdy handle or a shoulder strap for easy carrying, and may also have additional pockets or compartments for utensils or napkins.

A medium-sized square lunch bag is perfect for individuals who need to carry their lunch to work, school, or on a picnic. It's compact and easy to carry, but still spacious enough to hold a satisfying meal and other essentials.