Hello friends, getting ready to hit the trail in 4 days and was wondering if there was any reason to bring the Date Book and the Thru-Hikers' Companion. It seems that the Companion Book has the same point to point mileage information and of course much more information about each individual town/gap/shelter/mountain. I have separated the Companion into 13 parts to reduce weight and would like to ditch the Data Book altogether unless you feel it has some useful information not contained in the Companion Book. Thanks everyone!