love love love all the organizing tips. I am verified (insane!) type-A personality that loves organizing. Drives my DH nuts how i pick stuff up and put it 'away'.
anyhow- love the bins- but you drove down with those? We fly and so those might be hard to fit in the suitcases. however, we used the over the door shoe rack trick on our last few stays. at WL, it worked well- just put on the inside of the bathroom door- it was a floor to ceiling type shoe rack that just hooks over the door- and had like 20 pockets. I put sunblock, makeup, meds (high up where the toddler couldn't reach) and everything else in those pockets. we even found one for under $5 on sale! similar to this one
heck, i use one at home in our coat closet year round. i keep mittens, gloves, hats, scarves, dog leashes, dog sweaters and the like in the pockets at home. really easy to organize.
we also loved the $1 store pop up hampers, we used those for dirty clothes and haul our clothes down to the laundry!
my mom also bought us some 'space bags' and those came in handy when packing- like you, we do the ziploc bags, but i was able to fit stuff like nightgowns etc. into the space bags to save room!
for the stroller, we also have a large organizer bag we got at babies r us. it just attaches to the handle/back and has a large mesh bag for big items, then a smaller section in front of that with a zipped pocket and two other pockets (that are great for holding water bottles). Since our stroller doesn't have much of a basket below, we loved having this bag on the back to put in maps, sunglasses, sunblock, waters and even my camera in the zipped compartment.
it looks sort of like this:
for the car, we found a great little car trash thing at the container store- it has a little trash can and hooks onto the back of a seat (or the center console in our truck), it has a kleenex holder too at the bottom, you stick in a box of kleenex and pull them out through a little hole. i love that thing!