Kensington Securetrek Laptop Backpack BlackDescriptionSpecificationsShipping SecureTrek Lock Base lets you click in hammerhead zipper pulls to help prevent theft attempts and unauthorized access into your backpack Kensington Portable Laptop Lock (sold separately) secures bag to a fixed object Anti puncture zipper on the device compartment resists intrusion by sharp object Lock Loop ideal for a TSA approved travel lock when checking backpack at airport Padded device compartments hold up to 15.