Final answer:
Trash and ziplock bags are used to keep gear dry because they are effective at waterproofing. A waterproof bag is crucial for a sleeping bag to keep it insulating and comfortable. Similarly, wrapping food tightly reduces freezer burn by limiting its exposure to air.
Step-by-step explanation:
You would use trash and ziplock bags to prevent gear from getting wet because these materials provide a simple and cost-effective method for waterproofing. They can be sealed tightly to trap air and create a barrier against water. When it comes to a sleeping bag, using a waterproof bag is essential because it ensures that the sleeping bag stays dry and maintains its insulating properties. A wet sleeping bag can be very uncomfortable and could lead to hypothermia in cold conditions.
Another way to minimize freezer burn is to wrap food tightly before freezing. This technique minimizes freezer burn because it reduces the food's exposure to air, which is the primary cause of freezer burn. Freezer burn occurs when water molecules within the food form ice crystals on the surface, leading to dehydration and oxidation, which compromises the quality and taste of the food.