#19- yeah, try dragging the roller suitcase up/down stairs in Guanajuato. That's what convinced to me to say never again, bought a backpack and vowed to pack ultra light on trips two or less.
Ear plugs & mini travel alarm on the top of my list too. (btw, cell phone doubles as an alarm. don't need to bring both)

The roughest roll was the cobblestones in Antigua Guatemala but even that was OK.
Even in Mexico like Guanajuato there are cobblestone roads too. Those are just brutal on the roll-around luggage. I think those luggage or more desgined to roll-around on smooth surfaces which are commonly everywhere in the US (and most 'developed' countries) where they can better afford to maintain public access roads and sidewalks.
The hardest are sidewalks narrower than the bag, forcing you into the street, also very narrow staircases are difficult.
Not just that but some of the sidewalks are very high off the the street too and uneven from one property to the next.

I think the thing about scanning you ticket and passport, is one of the smartest things I ever heard of!!! You should do that. Also, the regulations for bringing fluids onto the airplane is strikt all over Europe and America, so never mind about that.
When it came to laundry, I stayed for 3,5 week, and we just handwashed everything in the hostel. Much easier and it dries of in a bit. We often foung hangers for laundry right outside our rooms!!
I have written a travelblog about backpacking through the Southern part of Mexico by the way, if you are interested in reading it go to travbuddy.
Enjoy yourself and don't stress
re scanning ticket and passport and putting them on my web accessible email. I have doing this for years and have posted that recommendation of this sight before, but I guess it bears repeating.
Since I am into repitition....might as well say again my method of light packing is to buy clothing from the salvation army, used clothing stores, yard sales etc. and pack those which I give away along the way sometimes "forget" them in a hotel room sometimes give them away(being careful not to insult anyone, because even the poorest Mexicans have a very strong pride and sense of self-worth). by the time I am ready to leave I am down to what I am wearing and perhaps one extra set of clothes. Like others, I have packed less and less over time, I have to really value something to be willing to carry it around for a month.
And I must confess, to a hidden agenda, I then have some room for some of the beautiful textiles and crafts that I find in my travels!

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<hr>Scan your passport as a PDF document and send it to yourself as an email attachment<hr></blockquote>
# 10 great idea. Why do you say as a PDF?

First time to Mexico I packed as if I were going on a safari- ready for any contingency. Over the years, aside from personal documents, I have realized that you can get everything there. You really don't need to take much. We have gone from two big suitcases back in the day, to two medium sized backpacks.

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<hr>I think the thing about scanning you ticket and passport, is one of the smartest things I ever heard of <hr></blockquote>
Oh yes most definately. As for the ticket, most airlines, are issuing e-tickets whereas they charge up to US$50 to issue a paper ticket. So opt for the e-ticket if available and that would be one LESS thing to carrry around.
my passport scan is a .jpg graphic and since I have been using e-tickets, all I need is a saved link and/or cut and paste ticket info from the airlines.
Also think that e-tickets are much easier to change, if need be, than paper tickets.
Also a thought about jeans, although all the chicas wear blue jeans (skin tight!) IMO few things are heavier, hotter, and take up more space than blue jeans. A below-the-knee flowing skirt (with pockets of course!) can be rinsed out and dried overnight and is more cooler and more comfortable than blue jeans.

again, thank you guys, you're so helpful and kind! ^o^
I'm going to see tomorrow if I could buy some cotton trousers and long skirts (as most I have are jeans)... and... ha-ha.... I guess I am just over anxious! @_@
BTW, will it be too crowded with tourists in March (6-18) so I should book hostels in every city I'll be going? (like Tulum, Chichen Itza, Palenque, and Mexico City)...Someone had told me that I should go there first, see the place and then book. But I'm just worried all cheap, quiet and clean places will be full of people (since my budget is $10 to $35 and of course, the cheaper the better)...big sigh///

The OP is only talking about two weeks, so it's not a big deal, but jeans take forever (and a day) to dry when you hang them on the roof to dry... and in the rainy season, fuggetaboutit!
I made a copy of the front page (the picture and ID section) of my passport blown down to business card size when I first started travelling. I had a few laminated to stick in my bags, in case there was ever a question about whose bag belong to whom. And, I carred one with me rather than carrying my "real" passport for the very, very, very rare occasion (so rare, it never happened) that I might have to show my passport to the authorities... if they wanted the original, they could accompany me (and the United States consul) to my residence.