The altura dryline rack pack has a waterproof dryline construction so you can carry your gear in any weather without worrying about water damage the bag is perfect for touring commuting or leisure use as it has a capacity of 7l giving you plenty of room to store whatever you need this saddle bag can be used easily on or off the bike it has a qr landing strip rack fitting so you can easily mount and dismount it finally the altura dryline rack pack has a transformer shoulder strap and carry