Yes, putting ice in a cooler is highly effective and absolutely necessary for keeping food and drinks cold. The ice absorbs ambient heat and melts, keeping perishable items out of the "danger zone" and chilling beverages.
Strictly speaking, you do not need to put ice in a cooler if your items are already cold and you only need them insulated for a few hours. However, ice or ice packs are essential if you are traveling long distances, transporting perishable food (like raw meat or dairy), or need your drinks to stay ice-cold.
Always prechill your cooler by filling it with ice overnight or, ideally, for a full day. Fill your cooler at least half full of ice, close it, and let the ice work to chill the internal space. Keeping that ice and melt water in there for 24+ hours is key to conditioning your cooler for long term cold performance.
In the 1800s, people kept things cold by harvesting natural ice during the winter and storing it in highly insulated structures called ice houses. This massive, global trade allowed icemen to deliver daily blocks of ice to homes, which were then kept in wooden "iceboxes" to preserve perishable food.
Bacteria thrive in that "danger zone" of 40°F to 140°F. As long as the temperature inside the cooler stays under 40 °F and the food itself has not expired, food packed in a cooler with ice is safe to eat. If the temperature inside the cooler goes over 40 °F, the food is only safe to eat for two hours.
Putting a penny (or any coin) in the freezer is an easy trick used to check if your freezer lost power while you were away, and whether your frozen food is still safe to eat.
Coolers that keep ice the longest are premium rotomolded or vacuum-insulated hard coolers. Industry tests and top performers—like the Cabela's Polar Cap Equalizer and YETI Tundra—consistently retain ice for 7 to 10+ days due to thick, pressure-injected foam and commercial-grade gaskets.
Where dry ice is placed depends on the desired temperature for the contents:
Icing Mistakes to Avoid
Icing too long – More is not better. Applying ice directly to skin – Increases risk of frostbite. Relying only on ice – Recovery also requires movement and proper care.
The most effective way to pack a cooler is to use a layered approach with the ice placed both on the bottom and the top of your contents. Since cold air sinks, this sandwiches your food and drinks in an optimally chilled environment.
According to the law of conservation of mass, after the water freezes, there will still be one pound of water since no water has been created or destroyed. All that has occurred is a change from a liquid state to a solid one. Thus, the weight will certainly not change.
Calcium chloride stands apart because it generates heat as it dissolves. This exothermic reaction accelerates melting on contact and explains why calcium chloride outpaces nearly everything else when asking what melts ice the fastest in brutal conditions.
5 Foods to Avoid Refreezing
People put envelopes in the freezer for two main reasons: to safely unseal them if you made a mistake (like forgetting to include something), or to secretly snoop into someone else's mail.
Many traditional Amish communities consider manufactured toilet paper an unnecessary luxury and use resource-saving alternatives instead. In outhouses, families often repurpose old newspapers, magazine pages, or catalogs (like the Sears and Roebuck catalog). To make the paper soft enough to use, they crumple it vigorously multiple times.
While individuals are born with LGBTQ identities within Amish communities, they cannot actively remain Amish while living openly. The culture does not allow for queer inclusion, and strict adherence to traditional gender roles means open LGBTQ members are typically excommunicated and shunned.
To say "hi" in Amish (Pennsylvania Dutch), simply say "guder daag" (pronounced goo-der dahg). It translates literally to "good day" and is the most common and appropriate way to greet someone at any time.
Health experts generally agree that processed meats are the unhealthiest meats to eat. This category includes any meat preserved by smoking, curing, salting, or using chemical preservatives like nitrates.
Pioneers prevented meat from spoiling by removing moisture and inhibiting bacteria through a combination of salting, smoking, and drying. Without modern refrigeration, these natural methods were essential for preserving proteins for months at a time.
Your food poisoning didn't come from food that was properly frozen. It can stay in the freezer 20 years and still won't make you sick. It probably won't taste very good though depending on how it was wrapped and other factors.