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A facile route for synthesizing a diverse array of cargo‐loaded polymer capsules using polymer‐stabilized calcium carbonate particles is introduced by Frank Caruso and co‐workers in article number 1400007. Cargo, ranging from anti‐cancer drugs to plasmid DNA, could be loaded in high quantities, making this technique promising for a variety of applications.

Polymer microcapsules are of particular interest for applications including self‐healing coatings, catalysis, bioreactions, sensing, and drug delivery. The primary way that polymer capsules can exhibit functionality relevant to these diverse fields is through the incorporation of functional cargo in the capsule cavity or wall. Diverse functional and therapeutic cargo can be loaded into polymer capsules with ease using polymer‐stabilized calcium carbonate (CaCO3) particles. A variety of examples are demonstrated, including 15 types of cargo, yielding a toolbox with effectively 500+ variations. This process uses no harsh reagents and can take less than 30 min to prepare, load, coat, and form the hollow capsules. For these reasons, it is expected that the technique will play a crucial role across scientific studies in numerous fields.