noun
bicycle bag; bike bag for public transport
A bag used to cover a bicycle when taking it on trains, buses, or other public transportation, as required by many Japanese transit operators.
輪行袋に入れれば、電車に自転車を持ち込めます。
If you put your bicycle in a bike bag, you can bring it on the train.
Compound of 輪行 (りんこう, 'traveling with a bicycle') and 袋 (ふくろ, 'bag').