@dorayme and @backpack, you are wonderful! Thank you so much for all the travel advice - this is exactly what I needed to know. Comments and answers to your questions:
I placed an emergency order last night for a Brain Cell and a CQPC. (Katy is the bomb! A point already proven in the Suddenly SALAD thread. And why does the word "SALAD" have to be in all uppercase? It that to frighten the unwary? Suddenlyyyyyy...SALAD! BAM! But I digress.) I have a feeling that the CQPC is going to be a piece I buy in every color because they are so crazy useful. But I started with one because delayed gratification is good for me. My kids are teaching me patience but not quickly enough, LOL.
I am leaving Sunday night and coming back Tuesday night. It's just me (*sniff*), no hubby or kids. I have an Aeronaut, Tri-Star, Western Flyer, and Empire Builder at my disposal, plus a Synapse and Co-Pilot. I think the Aeronaut will be overkill for such a short trip. The Western Flyer would have been my choice, but I need to bring a laptop. (What kind of lame training center doesn't have computers for us to use?) So I'm looking at the Tri-Star with my laptop tucked snuggly into a Brain Cell in the middle compartment. I'll use my packing cubes of various shapes and sizes, and I think I'll have plenty of room to keep everything I bring and go home with in the Tri-Star.
The laptop thing really freaked me out for a bit. If I carry my laptop around here, I use a backpack with a built-in laptop compartment. I didn't even own a sleeve that fit my work computer. I think a Brain Cell clipped into the Tri-Star is going to be super awesome: very secure and very practical.
My personal grooming habits are streamlined, but I don't typically like the hotel soaps so I will be bringing my own. I have an assortment of Go Tubes, which I was introduced to on this forum, so I'll just pack a wee bit of my usual shampoo, body wash, and lotion in them. I like the Burt's Bees products so I might splurge a little and buy a travel pack. I will also bring a Travel Tray to hold my little stuff. Thank goodness for that accessory. I'm the sort who has to check the room 3 times before leaving, just to make sure I haven't left anything behind.
It's going to feel so weird and LIGHT to pack for just myself. Maybe I should bring some diapers and a packet of wipes anyway, just in case someone else's kid has a potty emergency, LOL.
2 copies of my paperwork: check.
Thanks for all the links, @backpack! I love the maps. The Crystal City Wikipedia page was really interesting. I almost hope it is rainy while I am there so that I have an excuse to explore the underground pathways. I have a funny mental image of arriving at Reagan National Airport at night, then spending the next two days exclusively inside and underground, then emerging mole-like, with blinking eyes, on Tuesday evening when I go back to the airport to catch my flight home.