We found one dictionary that defines the word bubble envelope:

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1. bubble envelope: Wiktionary

Definitions from Wiktionary (bubble envelope) ▸ noun:  Synonym of padded envelope ▸ Words similar to bubble envelope ▸ Usage examples for bubble envelope ▸ Idioms related to bubble envelope ▸ Wikipedia articles (New!) ▸ Words that often appear near bubble envelope ▸ Rhymes of bubble envelope ▸ Invented words related to bubble envelope