I see a lot of tips for move in day but what are the best tips for dorm move out day?
Tell your kid to pack everything before you show up. 
What kind of tips are you looking for? I left everything up to my young adult student. He figured out everything and moved all his gear with no help from us and no expense that we are aware of, storing everything he wanted for the summer each year. D had S’s help while they were on the same campus.
Whatever it takes, do NOT be the last one out.
We don’t go to move-out day–our son flies home on his own. So I would advise, either do a pack-out with a summer company that stores your room items. Or beg a roommate who lives nearby to keep your bedding and winter gear.
As to the flight, have the student fly out at least a day after his or her last final. Because packing won’t start until the final is over.
And plan on paying for a second checked bag or fly Southwest where two bags are free. Certainly don’t fly Spirit where the weight limit is 40 pounds per bag (not 50 pounds, like everyone else).
Confirm and re-confirm when the student’s finals are so that you don’t book a flight DURING a final. I confirmed and reconfirmed but we STILL booked a flight DURING a final and change fees are EXPENSIVE and avoidable!
Our S flew home with a carry on and a personal item every year and still flies that way professionally for business trips.
If you can, have your student store all the college stuff in the college town. You won’t need any of it or use any of it in the summer anyway. Just make sure all clothing and linens are washed before they are stored.
There are two different kinds of move-out: The one in the senior year, and the one in any other year.
The former is almost like a relocation to another city, assuming that the graduate had a job lined up (the hiring company may or may not help the relocation.)
What kind of move-out did OP refer to?
I heard of this one:
Do not allow your roommates to leave campus until the furniture in the common area has been taken care of. (In a college where the students have well-to-do parents, this could mean that all furniture that has no-takers is discarded – I was shocked by this when I first noticed this phenomenon. Oh…,do not take it for granted that every roommate is willing to clean the room and the common area - many will choose to pay the fine for not cleaning the room before they leave. Like some may say: This is just not something I did before college, do in college and will do after college.)
Is someone driving to the campus to pick up your student? Or is the student flying home? These are two entirely different situations.
In the driving situation, you just stuff everything in trash bags, cram it in the car, and deal with it when you get home. There’s nothing difficult about it unless the student has acquired something that won’t fit in the car. In that case, something has to be done about storing the large object over the summer.
In the flying situation, there’s a lot more planning to be done.
Bring garbage bags or totes in case they haven’t started to pack. Usually in the dorms they have to be out within 24 hours after their last final, so people are moving out at different times, so in that respect it is less chaotic. Be prepared for their mountain of stuff (affectionately referred to as Dorm Mountain) to drive you crazy all summer.
I wanted to know if parents need to bring storage boxes or trolley.
The few times I helped my younger daughter move out of the dorm, I brought a few containers (storage bins). It helps if they have covers and it helps if they can be stacked if they aren’t needed, so they don’t take up as much space in the car.
I bought a small foldable hand trolley at Costco years ago and some years it has proven to be very valuable, other years not so much – it really depends on how close you can park to the dorm. We always bring some boxes, a roll of black trash bags, and a swiffer (with many refills). For graduation we make an extra trip during senior week and take as much as we can out of the room early to take pressure off of the graduation day (both kids were in a distance we could do in a day trip).
Thank you for helpful advice.
I got stuck with this every single year with D1. My first advice is be late. The likelihood of packing being done is greater if your kid has more time. Also, try to find out if roommate(s) will be leaving at the same time. It’s easier if just one of you is trying to get in and out. Do not, under any circumstances, allow your kid to leave to turn in a paper, return a library book, etc. Experience has shown that she will be gone for a long time and return when all the work is done. Do NOT agree to “just get started” while she finishes an exam. I once fell for that and packed up her entire room while her roommate’s parents packed up their daughter. We stood in confusion many times, wondering who an item belonged to since none of us recognized it. D2 and S knew I was wise to D1’s tricks and didn’t pull any of that stuff with me. All were a couple of hours away by car. Only one had a car and it wasn’t big enough to bring home all the stuff.
But don’t be so late that you arrive after the end time for checking out! One of my friends said one of her sons almost was fined $500 yesterday because he was supposed to be checked out by 11 a.m. and his dad (my friend’s ex) didn’t arrive until 11:15 a.m. The son’s keycard was deactivated on the dot at 11 and so he had to make many trips down and up six flights of stairs.
If this is a vehicle move, I highly recommend picking up about 10 of those large bags with strap handles they sell at the TJMaxx/Marshalls check out counter. They are about 99 cents each and not only hold a ton of stuff, but the tops can be tied shut and they fold up nicely for the fall move in.
They WILL underestimate the amount of stuff they have accumulated and the time needed to pack it up.
As someone earlier said…enjoy the new piles of stuff, with that permanent dorm smell, that will soon take up residence in your house.
My kid stored his stuff for the summer. I had to tell him to wash the clothes first. And not to pack wet towels, etc. I could imagine the smell after a whole summer in a hot storage facility.
I am reading this thread for motivation for the move-out next Friday. It isn’t helping 
Will have totes, trash bags, dolly, and Diet Pepsi.
Their dorm was told 2 days ago all beds must be de-lofted by tomorrow or the fine is $100/day. Grrr. She’s 5’ and the bed is very difficult to un-loft, let alone if they have a futon there is nowhere to put the bed. Why require it be done the day before finals start instead of requiring it be done by check-out?
And if your student has a key to be turned in or room needs to be left a certain way, remind them to comply because they do follow through with those fines!