NWT Lululemon Pack It Up Backpack 21L in Black. From workday to weekend, this backpack has all the pockets you need to hold your essentials—plus a little bit extra. Exterior and interior pockets keep your gear organized Exterior zipper opens up for extra ventilation (your sweaty gear will thank you later). Exterior water bottle pocket for quick access to hydration. Exterior padded pocket fits a 16" laptop. Trolley-compatible sleeve. Feel free to ask questions! Bundle to save :)