It’s important to note though that emissions are not the only thing to consider. My state banned single-use plastic bags a few years ago, and the number of them you see caught in trees or thrown away as litter has dropped to almost zero.
Plus, I think you could absolutely use those bags 400 times if you make good use of them. A few of the ones I have are from at least a decade ago and have probably been used far more times than that.
That actually sounds like a pretty cool job! I only said something because unfortunately a lot of people tend to use that fact to put down reusable bags, which sucks because even though they’re far from perfect, they’re still the better alternative (assuming you don’t buy a new one every time you go to the store).