红包的英文翻译为：red packet。
red packet：n.红包；
例：
Red packet containing a SURPRISE for each guest ( Limited amount only)!
当晚赠送免费红包惊喜（限量赠送）！
相关介绍
Instead of a red envelope at Chinese New Year, he now got a year-end bonus.
农历年他没有拿到红包，现在反而拿到了年终奖金。
Every year on Spring Festival, my parents give me a red envelope.
每年的春节，我的父母都会给我一个红包。
New Year's morning, people put forward to refining the small lights, with a red packet, go to the elderly and their relatives and friends New Year.
元旦早上，人们提着精制的小灯，拿着红粉包，出门向老人和亲友拜年。
