Crumpler laptop bag (Dig Large)
available in a few colours incl. black and green. Also available in Medium and XL. This one is suitable for 15-16" and at £20 ir seems to be a pretty good deal. Noticed the XL one in the Tesco Direct catalogue in store today for ~£50.
Here's the description from the web.
Protect your laptop from any bumps and scratches it may acquire during transit with the Crumpler Silver Dig Grey Laptop Bag. The stylish bag is expertly engineered using Chicken Tex Supreme™ hyper performance accessory fabric, a lightweight, durable and tear resist fabric specifically developed by Crumpler. The shoulder bag has an adjustable padded shoulder strap you can alter to ensure the bag is the ultimate in comfort and your laptop will be close to you during your journey.
The bag has a main velcro pocket which will securely hold your laptop, separate compartments accommodate any other essentials you may wish to carry with you. For short journeys to work or wild adventures you can be sure the Crumpler Silver Dig Laptop bag will keep your laptop safe and secure.
Original 1000d Chicken Tex Supreme hyper performance fabric
Waterproof Ripstop Lining
Protective seal to keep out water and dirt
Padded fixed laptop pouch with velcro closure
Large main pocket with velcro closed mesh pocket on laptop sleeve
Integrated back padding
3rd base handle adjustable shoulder strap
Velcro fastened main flap
42.5 x 30.5 x 10.5cm
fits 13", 14" and 15" laptops