YouTuber Hensama recently broke down every storyline in the “Bleach” anime, discovering that 164 of the 366 episodes were “filler episodes” unconnected with the ongoing plot. These range from recaps to holiday specials to entire filler arcs that deviate from the manga and never connect back to the main storyline.
Examples of this include the New Captain Shusuke Amagai arc that interrupts the ongoing Arrancar storyline, and numerous filler episodes centered on a possible conspiracy in the Soul Society. If you only care about what happened in the manga, click the article link below for a full list of the skippable episodes.
The explanation for these filler episodes is simple: the anime occasionally outpaced the manga it was based on. This is a problem that many anime that run into when their source material is still in progress, with other examples including “Dragon Ball” and “Sailor Moon.”