Hiya! Going to Reading for the first time this year and have no clue where to start with bag sizes. Been looking at 65L, and will be hoping to pack light - 4 outfits, toiletry and medical essentials, booze and food, sleeping mat, sleeping bag & tent of course, as well as essentials like charging packs etc. Will this be big enough? Im also nervous because I'm not very atheltic and only 5'4 so I want to be sure I can carry it! Cant afford a trolley unfortunately :(