They're called envelopes.

Many people use coin envelopes or similar packages, but many of them store them in some kind of plastic storage box - I’ve seen people using boxes designed for photo storage or for recipe cards. I use basic Sterilite containers - one for each vegetable plant family and others for herbs and ornamentals. I keep the seeds in paper envelopes (or the original packaging) and store them in the plastic bins inside a closet. I am not really interested in long-term (as in many many years) storage space this works for me.

I think that some people might be interested In a special box, but it would probably be a smallish market. I think that the people who are “serious” about seed preservation would need a very large container- but on the other hand some people like Craig Lehoullier keep them in pill bottles in a box on a desk

I think that if you pursue this idea, consider making it suitable for use in a freezer (it should fit in a standard kitchen freezer either a side-by-side style or drawer style). And should be airtight- with maybe even an extra compartment for silica gel to absorb excess moisture.

Seed envelopes (original packaging, with all the important info) bundled in doubled zip-lock bags, with room for packets of dessicant, works fine. Those can get stuffed handily in a refrigerator if you want to keep them cold. Slip an index card in the side of each zip-lock bag that lists the contents. Dessicant really isn't needed in the freezer, because water vapor there will be frozen solid on the sides of the bags, but is useful for when the bags are warmed up.

I use an old school photo album that has slide-in see through pockets that hold the regular sized packs you buy at the store.

Easy find at the thrift store for a couple of bucks!

i buy small zip/saleable bags (they're about 2x3") at an arts and craft store for like 2 bucks.. since i have a foodsaver vacuum sealer, i put the seed bags inside a glass mason jar and seal the jar. seeds stay viable for many years this way.

Perhaps you should first investigate just what is optimal for seed storage. Is freezing good? Is cold good? Is air tight good?

Are you asking about pretty purchased seed packages with beautiful photos of perfect produce on them, or seed that is harvested from your own garden that may be mixed with seed heads and dried foilage?

Are you asking with the intent of gifting to someone or marketing a product , perhaps? If a gift, it all depends on the person. If you are looking to market an item, it is my opinion that it would be a small market unless you capture the market of people who buy things that look cute but maybe are not really essential.

Serious home gardeners are often resourceful people who use what they have and what works.

I'm not the OP, but I frequently attend a local seed "bank" where you can get as many or as little locally grown seed as you like. I make small seed packets and store in a photo album (cheap at the thrift store) They also hold the store bought packages.

What has worked well for me for decades is using 3 large gallon sized wide mouth glass jars such as those used for dill pickles. I place the seed packets in the jars (1 jar for each season planting - 1 for early indoor starting seeds, 1 for outside spring seed planting, and 1 for fall planting seeds). I also place silica gel in nylon stocking inside each jar. The jars are then stored on the floor of my coolest dark closet.

I have an empty tackle box that I added cardboard dividers to, and keep the seed packets between the dividers.