During World War II, which innovative product packaging development was specifically created for military retail to improve soldier morale and combat effectiveness?

The military exchange system has played a crucial role in troop morale and welfare throughout modern warfare history. These retail establishments evolved from simple commissaries to sophisticated shopping centers that provide soldiers with everyday essentials and a taste of home while deployed. This trivia question explores how military retail operations adapted their product packaging to meet the unique needs of combat environments during a pivotal period in military history.

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K-Rations in waxed cardboard boxes with waterproof coating
M&M candies in cardboard tubes with specialized coating to prevent melting in high temperatures
Coca-Cola in specially designed green bottles with reinforced glass
Lucky Strike cigarettes in metal tins with camouflage patterns