Multiple different shopping cart instances

[eluser]TheManT[/eluser]
Hello!

I'm developing an application and i'm using the shopping cart.
The users can buy from different stores on my application at the same time.

Because of that, i need to create/use a different cart in each store that the users are visiting.

How can i use the cart library to build multiple different carts?

I've tried to load using different object name but they all are the same values.
$this->load->library('cart', '', 'cart_1');
$this->load->library('cart', '', 'cart_2');

Thanks for your attention!
And sorry for my bad english! ^^