It's wise to keep product boxes while a product is in warranty for ease of return shipping. Tag the boxes with warranty expiration dates to remind yourself to pitch the old boxes.
Martha Stewart shares a clever tip for ensuring you don't keep product boxes and packaging longer than their usefulness:
Putting warranty expiration dates on appliance boxes lets you know when it's safe to throw those cartons away. To store the receipt and warranty slips, place them in a cellophane bag. Write or type the expiration date on a self-adhesive label, and affix it to the bag. Attach the bag to the box with double-sided tape.
When it comes time to add a new box to the pile, simply scan over the large-print labels you've affixed and pull the expired ones to be recycled. Have a tip for combating clutter creep? Let's hear about it in the comments.