Expandable Design Large capacity backpack with expandable function to meet all storage needs Interior is compartmented for wet/dry items and devices, helping you stay organized and ready for varying loads Vacuum Compression Double shoulder bag with vacuum pump for maximum storage space Electronic pump included for easy inflation and deflation, enabling quick space optimization Materials Multilayer design with Oxford outer layer and TPU vacuum sealing bag Keeps items dry even in water, offering reliable protection for your gear AntiTheft Lock Custom combination lock for added security Password setting for protection during the trip Use scenarios Long trips or business travel Expand the main compartment to accommodate clothing, devices, and essential gear Use the interior compartments to separate wet/dry items and keep electronics organized Secure your belongings with the antitheft lock for peace of mind during transit and transit transfers Outdoor activities and water exposure The Oxford outer layer combined with the TPU vacuum sealing bag helps protect gear from moisture Vacuum compression maximizes space, making it easier to carry multiple items on hikes, camps, or beach days Daily commute and urban use Convenient organization for devices and accessories within the compartmented interior Security feature provides password protection for trips between home, work, and errands Notes on function and performance Expands to meet varying storage needs without sacrificing organization Vacuum pump and electronic pump enable fast, simple compression and decompression Durable materials designed to protect contents in dry and damp environments Custom lock and password setting add a layer of security during travel and daily use