My PB 17 is arriving on Monday so I've got to order my case today... The Timbuk2 website only shows an illustration of the sleeve and I can't see any detail at all.... Can you tell me: - Does it have that 'sling' feature that the Tom Bihn Monolith has to protect it? - How does the top close over to protect it say if it started raining whilst carrying it? - Are there any pockets for carrying anything else? - Can you use a shoulder strap with it? - Would you highly recommend it? Thanks, if you could reply really soon I'd TRULY appreciate it. Chuck.