The Thule Subterra 21L Backpack is made for busy days when we're running back and forth across town and need the ability to carry essentials, like our laptop, charging cables, a few snacks, and an umbrella with us to get everything done on the go. The 21-liter backpack offers plentiful organization with a zippered tech pocket that features an organizational panel with dedicated pockets for our power bank, notepad, pens, cords, and keys. The hidden back panel security pocket keeps valuable items safely stashed away, which is perfect for trips abroad when we are carrying our passports and some extra cash.