backpack 2023.03.13 backpackとは 意味・定義・例文 Noun 名詞 ばクぱク US /ˈbækˌpæk/ UK /ˈbækˌpæk/ 1. a large bag that is carried on the back when you are walking or climbing バックパック, リュックサック I'd like to get a backpack that's big enough to fit my laptop.