かさばる
かさばる · kasabaru · JLPT N1 · noun
to be bulky
📦 嵩 (kasa, bulk) + 張る (haru, to swell out) = swells out in volume, so it's bulky
The kanji 嵩 means volume or bulk, and 張る means to stretch or swell. Together they describe something that swells out in size, like a bulky package.