100% Lifetime PromiseYGSNTG Travel backpack: You can get lifetime commitment and friendly customer service support. If you have any questions about this Travel Laptop Backpack airplane backpack, please let us know at any time and we will answer you within 24 hours. This product is not suitable for use by 12 and under. Expandable travel laptop backpack brings great convenience for traveling, studying and working Large Capacity & ExpandableThe large travel backpack is 35L with 20 x 15 x 7 inch before expansion; 52L with 20 x 15 x 8.7 inch after expansion, you can choose to expand or original according to your daily needs. Large Carry on backpack has 12 pockets and the laptop backpack has a padded compartment that can fit a 18.4 inch laptop. The travel backpack's multiple pockets are designed to hold books, wallets, clothes, water bottles and more, keeping your belongings organized and easier to find Design for TravelThe carry on backpack can help you protect the contents