The first part of the Give rEUse a jirafa Green Light report gathers scientific studies explaining how well-designed reusable packaging systems contribute more positively to the environment, the economy, and society than single-use packaging does. Nowadays 40% of plastics and 50% of all paper used in the EU is destined for packaging, therefore showing how recycling cannot be the only option out of the single-use packaging waste crisis. By illustrating the key parameters of an effective reuse system as well as the conditions that are needed to implement them, this report acts as a complete guide to the world of reusable packaging.