KINGSLONG Business Backpack, Expandable Capacity 25-55L, Includes Vacuum Compression Bag and Vacuum Pump, Multi-Layer Storage, Multiple Pockets,

[Combined Use with Backpack, Vacuum Bag, and Electric Pump] The included vacuum pack and electric pump allow you to use the pack alone for short trips. For trips of 5-7 days, use it in combination with the vacuum pack. Thorough evacuation provides incredible compression power. Perfect for storing bulky clothing when traveling or on business trips. [Large capacity & expansion & compression functions] Approximately 45 x 30 x 15 cm (before expansion: approximately 25 L) Approximately 45 x 30 x 25 cm (after expansion: approximately 40 L) Approximately 45 x 30 x 28 cm (after vacuum compression: approximately 55 L) It can hold a 15.6-17.3 inch laptop, A4 size documents and files, 1-7 days worth of clothes, etc., making it a convenient business backpack for business trips and travel. [Scientific storage system] A total of 19 pockets are designed, including a main pocket, front pocket, back pocket, anti-theft pocket, A4 size file pocket, and wet/dry separation pocket, allowing you to separate your belongings and store them neatly. [High-Quality, Waterproof Fabric, and Ergonomics] Made with premium nylon waterproof and polyester fabric, each joint is reinforced with stitching. This backpack undergoes rigorous quality inspections, so you can use it with confidence. The breathable and cushioned mesh material absorbs sweat, preventing discomfort and shoulder discomfort. It also reduces pressure on the shoulders and back, ensuring a comfortable and fatigue-free carrying experience. [After-Sales Service & Precautions] Our backpacks undergo rigorous quality inspections, so you can use them with confidence. We offer free replacements for any quality issues. Precautions: 1. To ensure the airtightness of the vacuum compression bag, we've added a layer of TPU rubber to the zipper, making it difficult to open and close during initial use. If you experience any problems during use, please contact us. 2. An electric pump is not included. Please prepare six AA batteries in advance.