This Pacsafe backpack is in like new condition and has never been worn (it wasn't quite what my partner was looking for). It has all the security features that Pacsafe is known for and is light and easy to carry, even when full. You won’t have any problem packing for a longer trip and still taking this as carry-on. Measurements of the inside compartment: 21” tall x 13.5” wide x 7” deep More technical information can be found here: https://pacsafe.com/products/pacsafe-go-anti-theft-44l-carryon-backpack