Walmart offers the Stansport Modular Organizer Bag in Black, model no. 1262-20, for $4.23. (With orders of $25 or more, Amazon charges the same with free shipping for Prime members.) Choose in-store pickup to avoid the $5.99 shipping fee. That's the lowest total price we could find by $12. It measures 6" x 4" x 1.75" and features rear web straps for modular attachment and a webbing loop with "D" ring on top for extra accessories.

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