The Peak NE Pokketz (Rockfax) is an A6 size climbing guidebook that weighs less than 150 grams and is only 7mm thick, so it will fit in your 'pokketz'.
Detailing the best of the north eastern grit crags in the Peak area, Peak NE Pokketz (Rockfax) includes Rivelin and Bamford, the majestic Stanage, the Burbage Valley and Millstone and the other quarries in the area. The guide focuses on routes from Moderate to HVS and manages to pack more than 500 carefully chosen gems between its covers, but also includes 20 classic E1s and E2s to give something for everyone to aspire to. This book provides a compact and low cost introduction to the brilliant climbing found in the NE Peak Area. It is presented in the same clear and easy-to-follow style that Rockfax are renowned for but it has been stripped down to give just the essentials required by many climbers.