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A simple ziplock bag from the kitchen will suffice for storing your slime. Pick one that's just big enough to hold your slime. You don't want one that's too big, as you want as little air in the bag as possible. Zip up the bag partway, and then squeeze out as much of the air in the bag as you can. Air will cause your slime to dry out, so getting it out will help preserve your slime. Once you have as much air out as you can, zip the bag up tight. Go over the zipper again to ensure it's fully closed. Keep in mind the slime may stick to the bag. Sticking the bag in the refrigerator will help preserve the slime. The slime can grow bacteria and/ or mold , which will make the slime gross, but the refrigerator can slow that process down. Keep in mind that some slimes get hard when you refrigerate them, though.
Stick the slime in a plastic bag. Squeeze out the air. Zip up the bag. Place the bag in the refrigerator.