Integrated with a vacuum compression system, allowing you to pack up to 50% more items than a regular backpack. The one-way outlet valve allows for easy air release, whether by manual pressing or using a vacuum pump for rapid compression. This backpack expands to a spacious 55 liters, equivalent to a 24-inch rolling suitcase while keeping a compact, carry-on-friendly size. The main compartment features a combination lock, and a hidden back pocket provides secure storage.