In this activity, learners explore how product design differences can affect the success of a final product -- in this case a bag for holding candy. Learners work in pairs to evaluate, design, and build a better candy bag. Learners will predict the volume and strength of their original design, sketch the design, create a model candy bag, and then test their bag using weight. After testing, learners redesign their bag to improve it, and then retest. Pairs make predictions, compare results, and discuss their findings.