【Long-Lasting Insulation & Leakproof】Featuring 8mm foam insulation, this cooler backpack keeps contents hot or cold for up to 16 hours. The seamless hot-press construction and PEVA leakproof lining, paired with smooth horizontal zippers, ensure total leak protection. Perfect for beach trips, hiking, camping, travel, boating, games, and work commutes.【Waterproof & Comfortable】Made from high-density scratch-resistant nylon with a waterproof PU coating, this backpack is 100% waterproof and easy to clean. A breathable back panel and adjustable padded shoulder straps enhance airflow and reduce fatigue, while the padded back evenly distributes weight for stable, comfortable carrying.【Multiple Compartments & Pockets】Two main insulated compartments store drinks and dry food separately. Also includes a front zip pocket, two large side pockets, and hidden back security pockets. A built-in bottle opener adds extra convenience for outdoor fun.【Functional & Thoughtful Details】A large front pocket offers quick access to utensils, and a stainless-steel bottle opener is attached for easy drink opening. Eight webbing loops on the front allow you to hang keys, bottles, or tools, while a top elastic cord secures jackets or mats. Dual side handles provide versatile carrying options.【Spacious & Versatile】Measuring 18.0″ × 12.5″ × 8.0″ (H × L × W) with a 31-liter capacity, this backpack holds up to 52 cans plus meals, snacks, and essentials. A practical unisex gift ideal for the beach, picnics, hiking, camping, and more—keeping everything at the perfect temperature all day long.

• Double-deck 31L leakproof & waterproof backpack for outdoor: This premium cooler backpack delivers 16-hour temperature retention with 8mm foam insulation and a 100% waterproof, leakproof build. It offers 31L of organized space with multiple compartments, breathable padded straps for comfort, and practical extras like a bottle opener. Ideal for extended outdoor adventures, it keeps all essentials perfectly chilled or warm.