Maybe you're not 100% sure your wholesale customers all prefer the same draw. Some like it tight, others want a looser, airier pull. In that case, look for disposables with adjustable airflow.

These devices have a small ring or slider that lets you change the air intake. You can start tight and loosen it up if needed. This is especially useful if you're buying for a diverse group of users.

But adjustable airflow adds complexity. There's a small chance the mechanism could jam or feel loose over time. When evaluating samples, move the airflow control back and forth a few times to check it's solid.

Also, adjustable airflow doesn't change the coil resistance—it just lets you alter how much air mixes with the vapor. So even with the airflow wide open, the draw might still feel relatively tight if the coil is high-resistance.