I just started using the packing cubes from e-bags. They come in a variety of colors and sizes, and right now I believe they are 20% off. I love them. So much easier that the ziplock bags (for me), but I'm not packing for small children. There is a thread about them on the budget board somewhere.
I use packing cubes. Reusable and you can buy in all different colors. Each child has their own set in a different color. Ziplocks are fine for liquids but i hate using all that plastic.
I love packing folders and cubes. I am pooh size but can get a week's worth of shorts, tops, a sundress or two, and a couple of nightgowns in one 18" packing folder. I pack them by outfit in the opposite order that I plan on wearing them, so that when open the packing folder the first day's outfit is on top with the second day's next, and so on. It may be a tight fit, but as long as those velco edges meet, the packing folder will stay closed. I then use one packing cube (usually a slim cube) for panties and bras and a slim cube for two swimsuites and a coverup. I have a 22" Heys Exotic spinner that I use as a carry on and the filled 18" packing folder easily buckles into the upper side with a flip flop stashed at each end, then I have the whole bottom half for the two packing cubes, a white noise machine I can't do without, a Vera Bradly medium toiletry bag, and usually still have a little extra space left over. Electronics, sunglasses, and meds go in my personal item, along with paperwork, and my 3-1-1 bag of liquids. I can easily pack for a week in a carry on and one personal item, using packing folders and packing cubes. Last May we packed for eleven days using carryons only (using packing folders and packing cubes). I really prefer packing my clothes in the 18" packing folders rather than the packing cubes. It seems like I can get more in one. If we do decide to check a bag, then I use a 20" packing folder as more will fit in it.
I also have a 22" Kipling Teagan that I sometimes use as a carry on. With that bag I do better rolling clothes tightly. I can still get a week's worth of shorts/tshirts, a couple of nightgowns, bras, panties, flip flops, the toiletry bag, and white noise machine in the bottom section. I then usually put some food/snack items in the top section. Small laptop, Kindle, MP3 player, camera, cell phone, chargers, sunglasses, meds, and paperwork still go in the personal item.