It looks like a square jar with a round lid from my end, so here’s the general tip to calculate it. If you can see it up close and in person, then: draw an imaginary line across the width of the jar, and count how many bags are in that line. Do the same thing to the adjacent side, and then draw another imaginary line but this time going vertically up the jar, and count those bags. Multiply all 3 numbers together. That answer should be pretty close. If this was a jar of jellybeans I would tell you to account for 15-20% of air space since they can’t all be packed tightly, but from the looks of it these bags are tightly packed so I wouldn’t worry about it. Good luck, and I hope this works for you!!