Invitations: Use empty water bottles with cap or cork for the top. Make an invitation using your computer with all relevant information. Such as: "Come on over to (name)'s Hawaiian Luau Birthday Party!"./Date/Time/Island Location/Dress appropriately for some Wet & Wild Fun!/etc... Roll it up invitation and secure with a raffia bow. Put "message" in bottle. Add sand in the bottom with shells and glitter. You can mail the bottles with a label on the outside. Depending on the weight of the bottle, postage will vary. Our invitations cost $1.26 each using standard mail.