Hi Snowman
I do have some really nice bags I use. I use one bag for underpants, one for T shirts, one for sport shirts, dress shirts, and pants/jeans.
I can not pack in the storage areas we use in our Roadtrek for clothes without everything falling out. My wife does just fine:) Some of them are vented for air circulation.
They are luggage bags made by Eagle Creek. They are used to pack clothes before you put them in regular luggage. The sizes I use are about - 3 ea. small 9"x7"x3", 3 ea. med. 9"x13"x3', 1 ea. xlarge 10"x14"x6" and they are rectangular and stack easily. I also have one called a drop box 7" high tapered slightly, 11" long 7" wide.
http://shop.eaglecreek.com/packing-cubes/l/212
I'm very happy with them
Best regards