Travel Men 17 Inch Laptop Backpack Vacuum Compression Backpack Business Large Capacity School Backpack Expand Outdoor Backpack

The vacuum bag zipper is very easy to open and requires two hands to assist in opening. There is also an instruction manual inside, which is not a quality issue, but designed to prevent air leakage. Please be aware, thank you Product Name: Vacuum Compression BackpackMaterial: Waterproof Oxford clothSize: 49*32*15CMAfter expansion: 49*32*20CMCapacity: can hold a 17-inch laptopSeparate laptop bagUsing the vacuum compression method:1. Open the compressed vacuum lined bag2, put the clothes on the air-tight zipper3. Open the one-way exhaust valve4. Press to exhaust the air insideFunction:Breathable backComfortable foam shoulder strapsstrapAnti-theft zipper pocket on the backWaterproof/wear-resistant/moistureproofWet and dry separation areavacuum compression airtightpasswordboardingLarge capacity = 24-inch luggage