Which innovative military 'retail product' was first mass-produced during the Napoleonic Wars, revolutionizing how armies could be supplied in the field?

Throughout military history, the evolution of combat rations has been crucial to battlefield success. From ancient armies carrying dried meats to modern MREs (Meals, Ready-to-Eat), product innovation in military sustenance has shaped warfare outcomes. This trivia question explores a pivotal moment in military retail transformation that revolutionized how soldiers were supplied in the field, changing military logistics forever.

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Canned food (invented by Nicolas Appert in 1809)
Freeze-dried rations (developed by Count Rumford in 1800)
Vacuum-sealed meat packets (created by Napoleon's quartermaster in 1805)
Compressed biscuit tablets (formulated by British Royal Navy in 1798)