This storage box is called the Iris 4 x 6 photo keeper.  I purchased mine at Michaels (with a coupon) but they are also available at Joann’s, Walmart and Amazon.  Here is the Joann’s link.

ALL of my circular needles fit in this handy case!
There is enough room for same size needles with multiple cable lengths.
There is even an extra box for some double points and crochet hooks!
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