Cookie trays from the grocery turned upside down are great. I grab them from the church kitchen after coffee hour. I never buy cookies myself. The bottom (now the top) is black, but the rest is clear. A big block (or stack of blocks) fits nicely.

Don't know where I got so many, but I use the zippered bags that sheets or curtains come in. I leave one side unzipped for air, in case those fibers want to breathe...

I get the big ziploc type from Dollar Tree in the laundry section. The XXL (or XXXL) will hold a king size. The actual storage area is approx 17x21, excluding the handle area. It will hold my whole project with the yardage. Only one in package for $1.

I've also used old cotton pillow cases, with a safety pin and index card if needed. Usually for those projects that may take a while to finish...
But I do love those big ziploc bags! :)

I've been reorganizing my sewing room, and have found some great plastic containers at the thrift store and at the dollar store. Some only hold about a gallon size, and some are about half of a laundry basket. I like having them in solid containers, and I'm only paying $.50 to $2.00 each.

My projects are stored in 12" x 12" plastic hinged boxes that I get at hobby stores. They stack well. My expertise is starting a project and leaving it, so these keep things clean and organized for a good, long time. Which I seem to need!! (ADD or procrastination...take your pick!) :D

I do the same; I have them is all kinds of sizes.

I use plastic hinged storage boxes, called "scrapbook case," that are 14" square and 3 inches deep. They hold the whole project and stack well. I get them at Hobby Lobby in the scrapbook section. They retail for $9 but Hobby Lobby often has sales on them, anywhere from 1/2 off to $3 each.

I began using these about a year ago, first found them in sets of 5 at Costco...now find them in singles at JoAnns. Holds every thing plus pattern and notes .. :). I label the corners and when Project is finished I find a UFO to replenish the container. Lol.

Judy in Phx, AZ

I also use these and seem to have an abundance in all sizes. My favorite for blocks or project fabric pieces is the 2 and 2.5 gallon zip lock bags. I have a lot and reuse them. Many more planned projects and ufos, and I will soon run out!