if u r staying more than one nite in a town u will want your day pack.
day pack is just that its what u put your stuff in when youre going out for a day. it means u can carry a few esentials, wallet, water, munchies, jumper/jackt, tp/tissues etc without having to lug around all your gear. :greenguy:
unless u have really good cargoes i cant imagine traveling withouut a daypack, but then i'm the kind of person that brings a bag everywhere.
also bring a few extra plastic bags, they can come in really handy