My small Microshield backpack is the perfect size for me! I was looking for a backpack that was not too big & bulky but that would still carry my laptop in a padded section. The size means I can use it for regular days out with or without the backpack and it's perfect as my smallest hand luggage on planes.
The material seems really durable and rain resistant, although I've only had it a few days so am yet to test it out on a wet day.
Overall I am very pleased with this bag and the service from Zoomlite. I sent a message asking if my particular laptop dimensions would fit and they answered me promptly (and they were right, it fits!). I plan to use this bag a lot in my travels over the next couple of years.