"Pack Up Your Troubles in Your Old Kit-Bag" is a popular song from World War I, written by George Asaf in 1915. The song encourages soldiers and civilians alike to maintain a positive outlook despite the hardships of war. Its catchy melody and uplifting lyrics made it a morale booster during a challenging time. The phrase "pack up your troubles" suggests putting aside worries and focusing on the brighter side of life. The song became an anthem for resilience, symbolizing the spirit of those who faced adversity with hope and determination, resonating with many during the war years.