While I haven't used the Osprey Porter 46 yet I have the quantum day pack which is just the lightest and most versatile daypack ever. But full marks to Amazon for how they promptly dealt with a small glitch (the compression strap clips had the male component missing, but was able to get these from a local store which sold Osprey - at no charge). Its service like that which makes me love Amazon. And service like that we just don't get in Australia. So thank you Amazon. You are my favourite retailer and the reason why I shop online.