Each pack comes with 2 straps to secure it to you board should you choose to. 

 

Flip your accessory pack over and thread the straps through the attachment system as shown.

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Be sure to lengthen the straps first before looping them

Attach the pack to the board by securing using using the buckles. 

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Tighten the straps by pulling at the ends and using the strap loops to fasten the loose ends.

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Repeat for the other side.

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You would only need to do this once or when you switch over to a new board.