An activated-carbon lining coupled with our one-of-a-kind locking system makes the Transporter your go-to backpack for odorless escapades. Our backpack is now available in three water-resistant colors: Black, Camo, and Green. This bag is packed with s, including two water bottle holders. With a similar silhouette to our Classic Backpack, it's just sleek, lockable, water resistant, and lined with activated carbon to keep the in. And for extra peace of mind, the Transporter is outfitted with double zippers on the main compartment. All bags are uniquely keyed. Seriously, it's like you get a set of car keys for your backpack. We don't sell replacement keys; if you lose them, you're out of luck. Reactivating the carbon lining is easy: simply toss your backpack in the dryer on low heat for 10 minutes and you're good as new.