 This review paper examines recent advances in the use of nanocellulose for enhancing the barrier properties and other performance attributes of new generations of packaging products. Research has shown that nanocellulose can provide excellent oxygen barrier and water vapor transmission properties, as well as strength and resistance to humidity or moisture. Additionally, it has been found that nanocellulose-based layers can be prepared using eco-friendly methods, such as multiple layers of different materials or additives like waxes, high-aspect ratio nanoclays, and surface-active compounds. Chemical derivatization or grafting of nanocellulose are also being explored as potential solutions for high-end applications. However, the most common approach for large-scale production of nanocellulose-based packaging materials involves water-based formulations, such as dispersions or emulsions. This article was authored by Martin A. Hub, Anna Ferrer, Preeti Thiagi, and others.