The mesh material allows you to easily see your project, which is incredibly useful for colorwork. The snaps on the opening of the bag provide a snag-free environment and act as a yarn bowl of sorts because you can feed the yarn through the snaps and work out of it while on the go. Each Oh Snap set comes with a mini dot journal for keeping track of rows, pattern notes, etc.
S/M/L set:
S: 4" tall x 6" wide x 1.5" deep
M: 6.5" tall x 9" wide x 2" deep
L: 8" tall x 10" wide x 2" deep
The S size fits notions, the M fits up to two 100g sock hanks, and the L fits up to three 100g sock hanks.
XL/XXL set:
XL: 10.5" tall x 14" wide x 2" deep
XXL: 13.5" tall x 16.5" wide x 2" deep
The XL fits up to five 100g sock hanks and the XXL fits up to twelve 100g sock hanks.