A paper bag is a lightweight container made from paper pulp, typically kraft paper, used for carrying goods and packaging. It’s valued for being biodegradable, recyclable, and sturdy enough for groceries, retail items, and food service when reinforced with a flat bottom or handles. Unlike plastic, it breaks down naturally and is often preferred for brands wanting a more eco-friendly look. Modern versions come in various sizes, strengths, and finishes, from plain brown lunch bags to coated, printed bags used in retail.