For a 3 day trek a 75L is a bit big .
A 75 is good for a week long trek or longer and if you are planing on taking alot of gear for whatever reason then a 75 on a 3 is ok . If you are planing on doing any long treks in the future then a 75 will be good to have around.
I personally don't like it when a pack is too big for the job. I find if a large pack doesn't have much in it, what is inside will sit on the bottom because it's not enouge to fill it ,especially with anything 70 or over . I find the weight sits right on your bum. I like the wight to sit mid back or upper, nearer to top of my body .
A 40 could work but you would have to watch what you take, sometimes this makes people leave things behinde that maybe they should have taken like rain gear or just take the top, headlamp, one pair of socks or two ? ( especially people starting out or don't do it regulary ) .
A good size that would cover what you need for starting back into it is a 60L . You will find that size pack can cover a 3 day-er and week long trip and it's not bad for an over nighter .
If you haven't already done it you should check out the North Face Terra 60 pack .
A 60 is good for any from an over nighter to week long treks and real good for a 3 day-er .
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