Great Carry X Bag For your Electronics fashion backpacks anti-theft multifunction usb charging men rucksack 13 inch laptop computer backpack male Mochila Due to different production batches, the USB interface may have the following kinds: FAQIf you want to use External USB Charge Function, you have to do as follows:Q1:Is there mobile power inside the BuyerA1:No have.You need buy a mobile power Q2:How to use External USB Charge Function ?A2:.Connect your mobile power with the USB interface inside the backpack, Connect your phone with the USB interface outside the backpack,then charging begins4.Charging begins.A3:How to choose mobile powerThere are 2 kinds of mobile power in the market.Q41:Plug in your phone, you can start charging2:Plug in your phone also need to press button of mobile power then start chargingTo cope with this backpack, we suggest purchase of the first mobile power. ProductsPlease allow 1-2cm (0.4-0.8") differences due to manual measurement, thanks.Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. We Do Not Ship to PO/APO Boxes, HI or Alaska.All items ship within 24-72 hours of Payment.For large items that require Freight shipping a valid phone number is required to call and schedule your delivery.International shipping is about 20-45 business days.If haven't receive it after 45 business days, please let us know and we'll provide with the best solutionWe are not responsible for any customs. PaymentsWe accept PayPal payments only.Payment must be received within 2 business days after you commit to buy.Please make sure your paypal and eCRATER address is correct. Or not, please correct it before payment.Terms of Sale and FeedbackFeedback is extremely important for us and for eCRATER.If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority!If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative feedback so that we may resolve any concerns.We PROMISE we can make you happy if you give us a fair chance.Returns / ConcernsAll items qualify for returns within 14 days of receipt.Buyer is responsible for return shipping payment for any item that is not damaged.Please be sure this is an item you want before making your purchase.Customer Satisfaction is our TOP priority!Inventory on eCRATER changes constantly and it is impossible to maintain a perfectly accurate count of all items.Please do not penalize us if we have to issue you a refund!We would be happy to answer any questions you may have.