In general, I don't like to use straight pins because I end up getting poked with them. I do use those wonder clips or if I run out of those I use those metal clips that you squeeze the hinges together to open and flip them down to close (I don't know what they are called, you get them with the office supplies, come in different sizes, used to hold papers together but not paper clips) I usually clip them in stacks of 10 and neatly lay them in a flat box, or on a jelly roll pan, or a cake pan, or even just paper plates. If it will be a while, I also place the pattern or clue (do a lot of Bonnies' mystery quilts) on top of the pieces and then label the outside of the box or boxes. I even label the boxes 1 of 1, or 1of 2 so I know how many boxes of parts I have. I do have a baggie of baggies and I do use those on sometimes, but I do reuse those baggies.