Origami enthusiasts tend to accumulate lots of paper, ranging from inexpensive children's craft papers to pricey handmade washi or Chiyogrami paper. Since paper is very delicate, proper storage techniques are essential. You don't want your paper to be creased or wrinkled before you get a chance to use it!
The first thing to remember when storing your paper is to choose a location where it is protected from the elements. You want to keep your collection of origami paper safe from dust, dirt, water, or the sticky fingers of your children. It's also a good idea to keep your paper in a location that is away from direct sunlight, since this can fade the inks used to print many types of handmade origami paper.
There are several different storage techniques for keeping origami papers safe. Currently, I have my paper in a collection of pretty makeup bags I received as part of an Avon "gift with purchase" promotion. They are fairly large bags and look nice placed inside a wicker basket with my favorite origami books. Plastic zip top storage bags or large manila envelopes will also work well for storing origami papers, however. If you have a substantial paper collection, see if you can find a child's size shoebox that can be used for vertical paper storage. Stores that sell scrapbooking supplies also have paper storage products you can buy that are sized for 6x6 inch or 8x8 inch paper.
When sorting your origami paper collection, it's usually best to sort papers by color. Although it doesn't matter what color abstract or geometric origami models are folded from, color tends to be an important consideration for projects that are intended to represent specific people or objects. If you're going to be folding a tree, for example, you'll want to be able to find green paper quickly. If you're interested in making a paper Santa, you're probably not going to be happy with yellow paper for your project.
Many people don't really care where their origami papers come from, but I find it helpful to save the tags from my packages just in case a friend asks me about the supplies I used or I decide I need more paper in a specific design. Right now, I tuck the package tags in a small envelope that I keep next to my origami supplies. Most of the tags have small swatches of the paper designs printed on them, so it's easy to see at a glance which package a particular pattern came from.