Fruit – Can mashed bananas be bagged and then frozen

In professional smoothie/frozen youghurt/fruit shake shops, you'll usually see the fruit frozen in small pieces for easy portioning. So raspberrys and blueberrys are fine, but you'd wnat to quarter strawberrys and cube mangoes or apples or kiwis or whatever before freezing them.

The freezing process itself is important to the strucutral integrity of the fruit, and will affect its texture. However, if you only want them for smoothies/blended drinks, that isn't very important.

As a usage note, remember that a home freezer compartment is usually at -4 degrees Celsius, whereas a chest freezer (deep freeze) would more commonly be at -18 degrees. A good blender won't mind either way, but your lips might find it a bit cold.

Also, you might find you can buy the fruit pre-frozen from the same vendors the shops get them, in which case it will be prepared for you, and all you need is to defrost and blend. Aside from saving you the work of peeling and chopping, their freezing process may be better, and it'll probably end up being cheaper too.

I've done it before without problems. Even if they're peanut butter & jelly (something that's typically stored in the fridge), it has so much sugar in it that it's inhospitable to microbes.

If you want to play it extra safe, and the sandiwiches won't be easten shortly after you leave, you could place them in the freezer and then let them thaw in your bag.

... all that being said, if you're in the US, the TSA considers peanut butter to be a gel, so won't let you fly with a container of it. I have no idea what their rules are in sandwich form. (I've never tried it, as I typically fly w/ cold cut sandwiches, and just take them straight from the fridge before I go).

update from Erica : "I have flown with peanut butter sandwiches in our carryons. New TSA rules mean pulling it out of bags to send through the scanners, but they had no objections."