The unit price of this product only includes the price of the backpack，Excluding tax transportation，No other accessories such as water bags are included，If you need to issue an invoice and purchase other accessories such as water bags，Please communicate with customer service in a timely manner，thank you！ 

As most customers have reported that they need two water bags to fix the Velcro More solid Upgrade all products successively，Replace one with two in sequence，Due to the large shipment volume，It may lead to random shipments of two or one，If you have any special requirements, please contact customer service，Thank you for your support！