First post here, came across this browsing the Decathlon Website. At time of posting 3 colours are available for $2, the other 2 are the usual price of $4.50. Steel Grey appears to be the only one available for Click and Collect in NSW, all 3 colours are showing stock at at least 1 of the Victorian stores, haven't checked for other States sorry.
Description from Website:
This 10-litre hiking backpack has the perfect capacity for carrying all your essentials when you’re out for just a few hours: a picnic, water and a windcheater!
Foam-filled back and straps. Thumb loops.
Simple back and straps without ventilation system.
1 zipped pocket.