Vacuum Seal Compressionthis airbag reduces clothing storage space by up to 80% with vacuum-sealed compartments. Equipped with a one-way outlet valve, you have the flexibility to either manually press to release air or use a vacuum pump for faster compression. The main zipper is designed to be securely tight, requiring a bit of strength to pull; however, rest assured it is highly durable and won't break. Expandable CapacityThis backvac offers an impressive expandable capacity of up to 60 liters, equivalent to a 24-inch rolling suitcase. Despite its generous volume, it maintains the compact dimensions of a carry-on (20 * 12 * 7.8 inches), ensuring you avoid extra baggage fees and enjoy hassle-free airline boarding. Pack more without the worry! Multiple CompartmentsOur vacpack backpack with pump features three spacious main compartments and several hidden pockets for organized storage. It includes a dedicated dry/wet separation pocket to keep wet and dry items apart, effectively isolating damp clothes and odors. Additionally, a padded laptop compartment securely holds laptops up to 17 inches, ensuring your device stays protected. Anti-Theft DesignOur airback enhances your travel security with our anti-theft design. The main compartment is equipped with a TSA-approved combination lock, providing peace of mind when traveling. Additionally, a hidden zipper pocket on the back offers a secure place to store valuables, ensuring a worry-free trip. Ultimate ComfortYour comfort is our top priority. This vacuum sealed backpack features an ergonomic airflow design on the back, ensuring breathability and reducing heat buildup. It is equipped with thick, soft, ventilated padding on the shoulder straps and back panel, designed to alleviate pressure on your shoulders and neck for all-day comfort, even when carrying heavy loads.