I have both versions of this book. While you can keep the physical book in your training bag, the print is extremely, extremely tiny. Spend the extra money and get the e-book. You can print it and carry that around with you. You will also have no trouble seeing the illustrations without holding the page close to your face so you can look at the pics and work with your dog at the same time. The information is right on target. The suggested exercises are easy to teach your dog and they are specific to particular sports. In the e-book version, this is an excellent investment for less than the price of one entry fee in almost any sport!