For best performance always prechill food and drinks.
Two six packs, or one gallon (3.7L) of liquid will use approximately 2 lbs. (1.13Kg) of ice just to cool from room temperature. So plan ahead and cool off everything before you head out. You can even empty a few trays of ice into the cooler to prechill its interior.

Put the ice in last.
Cold air travels down, so if you want your beverage well-chilled, load cans and bottles first, then cover with ice.

Keep coolers out of the sun.
Ice lasts up to twice as long when the cooler is in the shade.

Crushed or block ice.
Use crushed ice to quickly cool food and drink, block ice to keep it cold longer.

Don’t drain cold water.
Recently melted ice keeps food and drinks cold. Melted ice water preserves ice better than empty air space.

Close lid quickly after opening.
Do not leave the lid open longer than necessary.

Use separate coolers.
Use one for beverages you’ll want frequently, another for the bulk of the food. The latter will keep ice longer because it will be opened less frequently.

Perishable foods.
Place perishable foods like meat and dairy products directly on ice. Sealed plastic containers will keep food dry.

Use dry ice to keep food frozen.
Place the dry ice (crystallized carbon dioxide) on top of the food. Be sure the dry ice is wrapped in heavy layers of newspaper. Do not let dry ice come in direct contact with the interior liner or with your hands.
(Note: Dry ice can also be used for attracting mosquitoes away from a desired area.)

Product Performance Guidelines for Packing, Using and Cleaning the Coleman® Xtreme™ Cooler

To achieve five-day performance in your new Xtreme cooler you must use it properly. Use plenty of ice and pre-chill items before you put them in the cooler. The following guidelines will allow you to achieve extreme performance.
37.5 lbs. for the 50 qt. wheeled ice chest (model 6263-707)
43.5 lbs. for the 58 qt. ice chest (model 6273-707)
27 lbs. for the 36 qt. wheeled ice chest (model 6251-707)
Coleman recommends using .75 lbs. of ice per rated quart of the coolant. We highly recommend using cubed ice.

Cleaning Your Cooler

Clean the inside and outside.
Clean the inside with a solution of mild soap and warm water, especially before first use. To remove tough stains, use baking soda and water to clean the inside.

Remove odors with a diluted solution of chlorine bleach and water.
If odor persists, wipe the interior with a cloth saturated with vanilla extract, then leave the cloth in the cooler overnight.

Always air-dry the cooler with the lid open before storing.