I like to change my purse with the seasons, using a more compact and colorful one in the summer and a slightly larger and darker colored one in the winter. Whether or not you change the actual purse, this is a good time to take a look at what's in yours and get it organized for the coming season.
This is a great 5-10 minute organizing project.
P.S. If you often lose your keys in the depths of your purse, use a carabiner to clip your keys to the strap and you'll never have to search for them.
Here in New England, the weather is starting to change from summer to fall (even though Thursday's forecast is 78 degrees!). One quick thing to take care of right now is to put away the summer sunblock, bug spray, and other summer cosmetics.
Round up the all the sunblocks in the house and check them all, tossing any that are nearly gone, nearly expired (or will be by next summer), or just gross from beach sand and grime.
Do the same with the bug sprays. While you're at it, test the sprayers and toss any that are malfunctioning (sprays a little trickle or has to be pumped 10 times before it will spray).
Gather any other summer cosmetics such as those bottles of ear drying liquid, mosquito bite spray, aloe vera, etc. Check these too to make sure they are full-ish, not expired, and in good condition.
Put everything worth keeping into gallon-size plastic freezer bags. If you don't have much, put it all in one bag. If you have a lot, sort it by type and use one bag per type. Store the bags near your summer accessories (beach towels, bathing suits) or near your luggage so it'll be handy when you pack for that beach vacation you're taking this winter. (You're taking me with you, right?)