designing bottle threads - any tips?

Hello, anyone have any tips on designing bottle closure threads? any good resources? thank you.

I have always just used the helix command on Rhino… seems to work however I haven’t relayed this to a real world application.

I will be designing a bottle in the future probably. I think the best bet will be just copy an existing screw cap bottle.

http://www.plasticbottle.com/techinfo/spi.html