Size Tip: Designed as a compact daypack, this backpack is optimized for everyday essentials. To save you time and ensure satisfaction, And you can Check out the real-life model photos in our detail page for reference! Ultralight Folding Day Pack: Weighing only 0.37 lbs (lighter than 3 eggs!), this rucking-ready companion folds down to a sandwich-sized 5.5×5 inches. Engineered for urban adventures and outdoor exploration, our ultralight day pack transitions seamlessly from your main bag/luggage to jacket pocket storage. More than just a backpack - it's your everyday freedom folded into minimalist design. Functional Design: Collapsible daypack features ventilated mesh shoulder straps for superior breathability and weight distribution. Dual-direction zippers ensure smooth access, while the stretchable front mesh pocket adapts to your essentials - from quick-grab items to cycling helmets. Stay organized with a dedicated rear pocket for notebooks, cards, or accessories.Perfectly suited for casual urban strolls and recreational cycling adventures. Durable & Weather-Ready Construction: Crafted from 75D ripstop nylon with twill reinforcement, this collapsible backpack resists tears, wrinkles, and light moisture. The water-resistant coating sheds spills effortlessly while maintaining featherlight portability - perfect for daily commutes or unexpected drizzles.(note:≠completely waterproof) Versatile Everyday Companion: This collapsible backpack transforms to meet your needs - from daily commutes and gym sessions to weekend getaways and shopping sprees. When traveling, its compact foldable design tucks neatly into your luggage as the perfect secondary bag. Lightweight yet functional, it adapts to every scenario, eliminating the "which bag to bring" dilemma. We stand behind our product with a 30-day hassle-free return policy.If you have any questions about our products, please contact us and we will provide the best solution! super lightweight hiking bacakpack