I purchased the Baggallini Triple Zip Bagg in Graphite after I returned the Baggallini Teeny Bagg which turned out to be just a little too teeny.  The Triple Zip is the perfect size for me.  I use it as a small bag when I just run errands.  It's large enough to fit all your wallet items, plus keys, cell phone, IPod and glasses with room to spare.  The strap is adjustable so you can use it cross body purse or make it small so you can wear it around your waist (my preference when I walk or run).  If I need to carry more things, I throw the Baggallini Triple Zip into a large bag or a tote and it will simply serve as a wallet.  I will be purchasing another one in a lighter color for the summer months.