Click & Send bags should only be used for Australia Posts Click & Send service. You can only access this online.

www.clickandsend.com.au/home/NISS_frm_home.php?sz_Client=AustraliaPost

There is a help page which explains everything you need to do. The address above is for both the Click & Send as well as the help.

Payment for Click & Send is with credit card or Paypal only.

That said, if you are sending items that fit in an A4 size package, is thinner than 2cm in thickness, you will be charged $1.20 for under 125g, $1.80 for 126 - 250g and $3 for 251 - 499g. You can add a Registered Post sticker for an additional $3.20 if you feel the need but I find it unneccessary as the majority of people are honest (I add it anyway for items with sale prices over $20)

The package should arrive with no problems. They will assume that the packet is being reused. Your item meets the above criteria for the cheaper rate so there should be no problems.