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Hey guys, what pack size do you reccomend for a full day hike in a warm mountain climate? We're talking about 20C°-25C° during the day and 19C°-15° at night, with occasional rain. I'm thinking a 20L backpack would do the job, but the sudden rain got me worried I might need to pack a rain jacket and a change of clothes, in which I'd feel better covered with a 30L backpack. What do you think?