Best way to test consumer reactions to sustainable packaging claims?

Conjoint analysis is your best bet here — it forces real trade-offs between price, brand, and eco claims so you're not just getting socially desirable survey answers. Tools like Qualtrics or Conjointly make it pretty straightforward to set up. If budget is tight, even a simple A/B concept test with 200-300 respondents can give you solid directional data on purchase intent lift.