#1 - Ability to put in everything I own and more (when I borrow/rent) the way I want it
#2 - Protection against the elements (thick padding, rain cover)
#3 - Comfort
#4 - Must have an external slot for water bottle
#2 - Protection against the elements (thick padding, rain cover)
#3 - Comfort
#4 - Must have an external slot for water bottle