Classic tube bag frame provides a lightweight build while supporting up to 20 kg, offering dependable daily use. Flexible carrying options: the bag can be carried by hand, over the shoulder, or on a bike, enabling convenient transport in a variety of situations. Practical capacity for everyday items: fits a mobile phone, computer, wallet, and lunch boxes for work, and also accommodates glasses, clothes, gloves, a water bottle, food, and other tools for travel or daily activities. Protective cover with quick access: the design adds a cover that closes with a zipper to shield contents from sun exposure and other elements. A pocket on the bag cover allows fast, easy access to your phone. Detachable front rack and waterproofing: the front bag features a detachable rack that is waterproof, and the rolled edge design increases available storage space for additional items. Use scenarios Commuting to work or school: carry your phone, computer, wallet, and lunch in a compact, lightweight frame while staying organized and protected from sun exposure. Daily travel and errands: use the bag's versatile carrying options and the detachable front rack to keep essentials secure and accessible, from glasses and water bottle to food or tools. Short trips and outings: rely on the waterproof front rack and expandable space to manage items you collect on the go without compromising comfort or protection.