One Piece is one of the longest-running anime in the medium's history, but despite its long-standing nature, the series is nowhere near finishing up. The pirate-themed shonen (based on Eiichiro Oda's legendary manga of the same title) has well over 1000 episodes — only a small percentage of which are of the filler variety.
One Piece Filler Episodes and Arcs You Can Skip
From the beginning, One Piece has tried its best to avoid meaningless episodes, but even this shonen masterpiece has filler content worth skipping.