If you have items in your cart that you would like to buy, but not right now, you can save your cart by going to My Carts, and clicking on Save Current Cart. It will be availabe to you on future visits, until you decide to delete it or submit the cart as an order.
To buy items you saved previously, click on View Saved Carts, select the cart you would like, and click GO. The items will be added to your current cart.
To delete a saved cart, click on View Saved Carts, select the cart to be deleted, and click DELETE.