Why Do Two Bag Factories Give Different Prices for the Same Design?

You send the same tote bag drawing to two factories. One quotes USD 3.20. Another quotes USD 5.80. At first, it feels like one of them must be wrong. Maybe the higher factory is overcharging. Maybe the lower factory is trying to win the order. But in real custom bag manufacturing, two factories can look at the same design and silently make very different assumptions about fabric weight, lining, zipper grade, logo process, sewing reinforcement, packaging, inspection, sample revisions, and export preparation.
What Affects Custom Bag Manufacturing Cost

A custom bag quote can look simple on the surface: one product, one logo, one quantity, one unit price. But in real manufacturing, that number is built from dozens of small decisions. The fabric you choose, the number of pockets, the lining, the zipper grade, the stitching method, the logo process, the packaging, the sample revisions, the order quantity, and even the shipping carton can all change the final cost. That is why two factories can quote very different prices for what appears to be the same bag.