Start with the use case, not the catalogue.
A straw project is affected by beverage acidity, carbonation, serving temperature, expected drinking time, cup format and the way the straw is packed or attached. Those factors should be agreed before material selection.
For a telescopic format, compact pack length and the opening interaction are part of the product system—not an afterthought.
Define a meaningful trial.
A useful evaluation names the beverage, the duration, the temperature and the visual or tactile acceptance criteria. This lets a supplier compare options on the same basis and avoids treating a single demonstration as a universal claim.
LVTU can help turn those project conditions into a product, material and testing path.