Here's a short and clear caption you can post on Binance Square about a Red Packet code:

"Grab the latest Binance Red Packet code and claim your rewards now! Limited time only – don’t miss out! #Binance #RedPacket #CryptoRewards"

If you're sharing a specific code, you can write:

"Red Packet Code:BPP6O6BJCK — Claim it before it’s gone!