(I'll take the bait)
The coffeebags are a bit of an upgrade to instant coffee satchels (although many have used instant and grounds to keep the weight/volume down and speed the process up).
Coles are doing them at half price with a limit of 12 but even so, they are $30/kg (instead of the whopping $60+/kg they normally are)
For me travelling anywhere, the Aeropress and a Stainless Filter are the first things packed, even if you pre-grind fresh coffee at home it's an improvement on all the other convenience coffee options. Weighs not very much, is x-ray friendly in carry-on baggage and I've never had any reason not to take it with me on aircraft and even motorbikes in a backpack.
All you need is a kettle.