From the publisher's website:
By taking advantage of Print On Demand technology, MMP has produced a softcover version of the 2nd edition ASL rulebook. Printed on thinner paper than the regular rulebook, the Pocket Edition is less than 3/4 inches thick and measures approximately 7.5 X 9.5 inches.
The Pocket Edition contains core Chapters A-G and the full Index. Previously published errata pages are incorporated in this version of the rulebook; but individual errata items (as of Jun 15, 2015) are incorporated as a separate listing in the index.
The Pocket Edition also sports a handy IFT chart on the back cover as well as several frequently used tables inside the back cover.
The Pocket Edition is not meant to replace the full 2nd edition rulebook, but it is a comprehensive and handy tableside reference to the core rules that no devoted ASL player should be without.