I'm always looking for fun things to send through the mail in unusual packaging. I did a group of these for Halloween, but round two is going out this year for the kiddos to play with on July 4th. They sell these tubes of glowsticks for a buck at Michael's and the dollar stores in the area. When I was little I remember begging my mom for one 4 dollar glow necklace at amusement parks, so it's like gold.
They are already sealed, I just added a mailing label-stars and the stamp....for under 3 bucks I'm keeping my status as 'cool aunt' not to be confused with postal service status as 'annoying customer.' You win some. You lose some.