Sisters are like:

fly swatters- always have on hand in case you need to extinguish an icky bug.
politicians- they have an opinion on everything.
mosquitoes- with an amazing honing ability, they can find you, no matter where you are.
appetizers- if you're hungry (sad, angry, depressed) they always make you feel a little bit better.
the Internet- they have the answers to just about everything.
post-it notes- they help you remember the things you have to do.
holidays- a nice little break from real life.
sports bra- need some (moral) support? Find a sister.
punching bags- they are a great outlet for anger: yelling and venting to someone always helps.
silver necklaces- they're perfect for any occasion.
old sneakers- they'll bring you anywhere you want to go. almost
bobby pins- you can't do prom hair with out them.
tampons- once you know what they're like, you just can't live without them. ;)

Sisters are like oxygen- they're just ... necessary.

lovelovelovelovelovelovelovelovelovelovelovelovelovelovelovelovelovelovelove