Thule Aion's multifunctional backpack expands from a 28L day backpack to a 32L travel backpack, increasing usable space by 15%. It has a practical partition for separating everyday items from active equipment. For easier packing, the back panel of the backpack can be completely unzipped and opened like a suitcase. Inside, there is a divider with a TPU insert, which makes it easier to organize your gear and prevents the transfer of moisture, odor or dirt to other items in the backpack. The travel backpack also has dedicated compartments for storing electronics and a pocket for a water bottle. With your backpack, you can use the Thule Aion Sling waist belt (sold separately) to take the strain off your walk and make it easy to quickly access your most important small items. The backpack can be expanded from 28L to a 32L travel backpack, which means a 15% increase in storage space. The easy-to-clean TPU compartment keeps things organized and prevents odor, moisture, and dirt from spreading to the rest of the backpack, and can be folded away when not in use. A zippered top pocket allows you to store small items safely and orderly so that they are always close at hand. Compatible with Thule Aion Sling Bag, which allows you to use a supportive waist belt (sold separately). An external concealed quick-access pocket allows you to easily store small items. The padded pockets can safely store a 15.6" PC laptop, a 16" MacBook, and a 12.9" tablet. The pass-through belt allows you to attach the backpack to the telescopic handle of the suitcase on wheels. A special water bottle pocket allows you to store your bottle safely so that it is close at hand. An internal zippered pocket allows you to safely store your phone, charger and other smaller items for convenient travel. External loops for attaching a carabiner to allow you to attach items to the backpack in order to prevent them from being lost. The outer shell fabric, lining and mesh are made from 100% recycled polyester from recycled plastic bottles. The 600D waxed canvas outer fabric is highly durable and features a toxic-PFC-free, water-resistant finish to repel moisture, dirt, and stains. Exterior finish with an elegant patina of signs of use. All Thule Aion products are bluesign® certified. Colour: Black Material: Waxed P600 Polyester External dimensions: 28 x 23 x 47 cm Volume: 28-32 l Weight: 1.23 kg Colour: Black Volume: 32 l Laptop pocket: 15" diagonal, 16" diagonal Material: Polyester Material Type: Synthetic