I was just asked on AskPhivy to do a "What's in my bag" post since the reader wanted to downsize her bag. I currently am toting around a relatively small LAMB purse (it's about 12" long, 8" tall) so it's a great grab-and-go bag.
I try to keep my purse relatively organized, since nothing is more annoying than searching for your keys at the bottomless pit that is your purse. When I emptied out my purse, I realize I only keep the essentials and try to compartmentalize things as best as I can (especially beauty supply stuff):
1) Keys - car keys can be separated from home/work keys in case I valet my car. My Henri Bendel keychain was given to me by my mom because I was born on the year of the pig!
2) Wallet - this LAMB wallet is a bit larger, but that means I can carry coins and not have to fold any bills/receipts.
3) Canon PowerShot - a great point and shoot camera that I can carry and have accessible at all times.
4) Samsung Nexus - obviously I'll need my phones at all times.
5) Hair tie - I'm a girl!
6) LAMB wristlest - I put all of my beauty supplies (see below) in here so that they don't get lost or leak everywhere.
7) Extra Gum - I mean, come on, we all need gum.
8) Samsung spare battery - One of the perks of not having an iPhone is the ability to switch out my battery to a fully charged one so I never worry about my phone dying.
Inside the wristlet, I put my lipgloss, chapstick, etc so that I don't have to continue to search for things in my purse. I normally just wear Vaseline or chapstick to work, but if I decide to go out to happy hour or somewhere after work, I carry lipstick with me to give me a little extra pop of color.
4)
Neosporin Lip Health - I'm addicted to chapstick and will keep 1-2 different types of lip balms at any given time on me.
The one thing I left at home is a red Moleskin notebook that I always have to keep thoughts, reminders, and lists.
Hopefully that helps give you a sense of what I'm always carrying around and if you have excess things that make your purse 15lbs, you can see that really, all you need are a few essentials to go about your day!