today went to the bank to change $20 notes for red packets. no $20 available, only $10. so i changed $10. told my husband that we will be giving $10 instead of $20 and my husband, who happened to be a hong kong chinese.. insisted that we give $20. small issue, but i thought the red packets is sort of like, bring 'good luck' and 'prosperity'. is the amount very important? maybe i am not in hk long enough. will someone please enlighten me?