You can pack whipped cream in a bag, pre-load it, refrigerate it, rubberband the bag after shaking the cream down into it, and then twist the end of the bag.
Here's a breakdown:
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Load the Bag: Fill a pastry bag or similar bag with whipped cream.
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Shake it Down: Shake the whipped cream down towards the tip of the bag.
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Twist and Seal: Twist the end of the bag to seal it.
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Secure with a Rubberband: Use a rubberband to further secure the twisted end of the bag.
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Refrigerate: Keep the pre-loaded bag in the refrigerator until ready to use.