One is for silver change (nickels, dimes, quarters) which I keep and use for tolls, meter parking, vending machines, etc. and the other is for pennies. Whenever, my pennies are over flowing I go to the bank.
Yesterday, I had a full change purse of pennies that ended up totaling $1.78. So, I deposited this amount in my checking account. You may be asking yourself, "why on earth would you deposit $1.78 of pennies into your account?" My rationale for this, is money is put to better use sitting in my interest bearing checking account than sitting in my change purse.