DIMENSIONS NOT extended: Volume: About 28L Size: 12.2" x 16.5" x 8.1" / 31cm x 42cm x 20.5cm Suitable for a 1~3 day getaways Note: Complies with the personal item size regulations of most airlines. Extended (with zip expansion): Volume & Size: Before the expanion: about 28L, 12.2" x 16.5" x 8.1" / 31cm x 42cm x 20.5cm After the expanion: about 38L, 12.2" x 16.5" x 10" / 31cm x 42cm x 25.5cm Suitable for a 4~6 day trips Weight: 2 pounds / 900g Materials: Nylon Accommodates a 40oz water bottle. Product Care: Machine washable Laptop Compartment: Fits a 15.6-inch laptop in the main pocket, and a smaller pocket for items like iPad, Kindle, or Nintendo Switch.