Expands from a 28L daypack to a 32L travel backpack for 15% more packable space The easy-to-clean TPU divider keeps items organized and prevents odor, moisture, and dirt from spreading to the rest of the bag, it also tucks away when not in use Zippered top pocket keeps small items secure, organized and within reach Compatible with the Thule Aion Sling Bag which doubles up as a supportive hip belt (sold separately) Quick-access external stash pocket helps store small items Padded storage protects a 15.6" PC/16" MacBook and 12.9" tablet Pass-through panel allows you to secure the backpack to rolling luggage Dedicated water bottle pocket keeps your bottle secure and within reach Internal zippered pocket stores a phone, charger and other small items during travel External daisy chain allows you to attach items to the bag Outer shell fabric, lining, and mesh are made of 100% recycled polyester from recycled plastic bottles The 600D waxed canvas shell fabric is highly durable and includes a water-resistant coating free of toxic PFCs that repels moisture, dirt, and stains All Thule Aion products are bluesign® certified Technical data Color: Dark slate Gender: Unisex Material: Waxed P600 Polyester Canvas Volume: 28 L Dimensions (L x W x H): 28 x 23 x 47 cm Weight: 1.23 kg