The first considerations would be based around your specific requirements. Are you going for the toughest bag? The lightest? Something that has a ton of tech built in? Those types of questions have a tendency to lead you to your competition. You can then use the materials of choice from your competition as your baseline.

From here, you can start looking at materials that would beat or at least match your competition. A comparison of the materials should include the technical aspects, as well as the commercial. How much is it? But also, where is it readily available? That will start to guide you to manufacturers. Of course, there is shipping to consider from the manufacturer to your distribution center. So you'll want to compare if it's cheaper to use a manufacturer closer to your distribution at the cost of shipping the raw material or if it's cheaper to use a manufacturer further away and pay to ship the finished product.

Sorry, that ended up being a bit longer of an answer than I was originally aiming for. As you can see, there are a lot of questions that need to be answered to guide you towards your material selection and manufacturer selection. Feel free to reach out to discuss this with me further. I have a few manufacturers in North Mexico who have textile/sewing operations. I'd be interested in seeing how your business develops!