the.com/lighthearted
Carrying your worries like a balloon, not a backpack.
means Cheerful and free from care, treating life with an easy, untroubled spirit.
from From Old English ideas that the heart held emotion, so a light heart meant one unburdened by grief, unlike a heavy one.
Anatomy of moodAncient belief: the heart, not brain, felt feelings.
Opposite weightHeavyhearted is its older, gloomier sibling.
Cousin wordLevity shares the Latin root for lightness.