I actually didn't purchase this book because Amazon cancelled my order because it was out of stock-- so I walked to the library.

Ok I have a few things to say about this product. I commute to work everyday by bike and I was looking for a smaller bag to substitute for my larger one during the summer where the weather is a lot warmer (read: I sweat a lot more). This bag had great reviews and came in a variety of sizes. So, onto the review..

Book well written and helpful. I am sharing book with a friend who is a children book writer as it was very helpful

I cannot deal with it. 1st the on/off button fell out of it & I haven't been able to recover it. the company will accept the unit back for repair but I can't even find the mini USB connector which charges the battery so the unit can be used.