When you cut the bag open, cut about 1/2" below the top and 1/2 way across the bag. You want to have 1/2 of it still attached - I'm holding the tail.
After taking what you need, gather and hold the top in your hands.
Now, take the tail and wrap it around the gather you just made . . .
and tuck the tail under the wrap - kinda like tying a balloon.
You should now have a sealed bag that's ready to go back in the freezer for the next time you need it.
The bag closes well, it doesn't seal, but keeps things from going in and coming out. This works great for other bagged foods as well. As long as the bag is soft and pliable, you can do this trick. This will save you from finding a container or plastic bag for storage.
Comments or questions are always welcomed. I would love to hear what you think of this tip or any of my other posts. Thanks!