Q&A for How to Keep Sandwiches Fresh

One way to do it is to dampen a paper towel, thoroughly wring it out to remove excess moisture, and lay it over the top of the sandwiches. Close them up in an airtight container and put them in the fridge. It’s also a good idea to keep sandwiches wrapped up until the moment you intend to eat them.

Keeping your sandwiches refrigerated or putting them in an insulated cooler or lunchbox will help the ingredients stay fresh. Although it seems counterintuitive, spreading on a layer of mayo, butter, or another condiment of your choice can help create a barrier and keep the bread from getting soggy as fast. You can also preserve your bread longer by packing the bread and sandwich ingredients separately, then assembling the whole sandwich right before you eat it. Toasted breads, crusty breads, and tortillas also tend to hold up better than regular sliced sandwich bread.

Tinfoil is great for keeping your sandwich from drying out, and it’s also good for keeping warm sandwiches warm. One drawback to using tinfoil is that it can react with acidic foods (such as tomatoes) to create an unappetizing—but harmless—blue residue.

You should probably eat sandwiches within 3 days. Of course, if it doesn't look or smell right, you should not eat it regardless of the number of days.