I was a bridesmaid three times. Although I am not a professional, I may let you learn from it. First of all, the carry-on bag must not be too big or inconvenient to carry. It's best to choose a satchel, because you may have to carry the bag for the bride on the wedding day, and you may also act as a temporary "maid". You'd better prepare enough of the following items in your bag: dry wet tissue, cosmetic bag (lip gloss, mascara, blush, comb, mirror, black hair clip, etc. ), sober drinks (wine country heroes are very useful when bridesmaids can't avoid blocking the wine for the bride), chocolate (you can replenish energy when you don't have time to fill your stomach, but remember to clean your teeth after eating), paper and pen (write down the bride in time).