If you're storing food in the freezer, it makes sense to label the contents and note the date. To ensure you can do that easily, keep a pen inside the freezer itself.
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I always have a few pens on top of my fridge/freezer for shopping lists and food labelling, but making sure those stay in in place is easier for me because I live alone. As ABC 702 morning host Linda Mottram noted the other day (right before I popped onto her show to discuss alternate messaging apps, you may need a different approach if you have a family:
I keep my marker pen in the freezer, because if I keep it next to the freezer, the kid grabs it.
Having experimented with different pens, Linda suggests a permanent marker works better than a cheaper pen, which will tend to stop working after extended periods of freezing. Worth adopting, especially if your freezer is filled with mysterious glacial objects.