Check out this cool way of folding your gi so that is nice, compact and secure.
This video is very detail on exactly how to align your garment, folding it and tying the belt
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Judogi is the formal Japanese name for the traditional uniform used for Judo practice and competition. It is actually derived from traditional articles of Japanese clothing. Jigoro Kano derived the original judogi from the kimono and other Japanese garments around the turn of the 20th century, and as such the judogi was the first modern martial arts training uniform. Over the years the length of the pants and sleeves grew longer, changes were made in the material and fit, the traditional unbleached cotton is now a bleached white, and blue judogi have become available, but today they are still very close to the same practice uniform used 100 years ago. Other martial arts, notably karate, later adopted the style of training uniform used in judo.
A judogi comprises three parts usually cut from different styles of fabric, a very heavy uwagi or jacket, a lighter canvas style shitabaki or pants, and a cotton obi or belt. Though similar to the shorter styles of kimono, a uwagi will invariably be made from cotton or a cotton blend and be of a very heavy weight fabric. All but the cheapest and most lightweight uwagi are cut from a woven cotton cloth, similar to, but much more tightly woven than terrycloth, and more expensive competition and hand-made judogi will often weigh several kilograms when finished. Due to the nature of Judo practice they commonly have heavier stitching and double layer kneepatches to provide durability. The obi comes in different colors to denote the wearer's rank in judo.
The left side of the gi must cross over the right one.