Acupressure wrist bands are popular, and they sell in large numbers. We do not endorse the following and apparently there is a DIY method of using the benefits of acupressure for motion sickness. You'll find a point on the underside of your arm about an inch and a half above the wrist crease between two tendons. Press in there fairly hard but not so hard that you get a bruise. It is reported this can help with motion sickness.
Here are some links to wrist band sites (not endorsed by us):-
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