Most probably have never heard of this machine before (including myself), but the Ultralieve is an ultrasound therapeutic massager and this is the bag used to store it and it's gel.
However, this bag could definitely come in handy for many other things too :)
I have checked which stores have it in stock and some of them do in VIC and NSW, but I haven't checked other states. It will say Sold Out in bag, but if you add stores for C&C then select a store it will show that it's in stock.
Proof: https://imgur.com/a/uPS98
$24.95 on their website http://www.ultralieve.com.au/ultralieve-au-accessories/ultra…)
$24.00 at The Good Guys (https://www.thegoodguys.com.au/ultralieve-ultralieve-bag-167…)
Available in Karrinyup WA. I have no use for it but it might be a good deal for somebody.