noun
roller bag; wheelie bag
A suitcase or bag with built-in wheels and a retractable handle, commonly used for travel. Wasei-eigo from 'caster bag'.
wasei-eigo (Japanese-coined English), from caster bag
旅行にはキャスターバッグが便利です。
A roller bag is convenient for travel.
空港でキャスターバッグを引いている人をよく見かける。
You often see people pulling wheelie bags at the airport.