Packing Cubes - why wasn’t I told?

I have purchased 2 sets of packing cubes from Zoomlite online.  They are fabulous for keeping our clothes organised, and you can fit heaps in them if you roll your clothes.  We have had to relook at how we travel/pack, with only 7 kg hand luggage allowance on domestic flights.  My hand luggage case weighs 3.5kg empty, so that will be getting swapped out for my new backpack which weighs in at just under 1kg.  

Packing them, t shirts in one, shorts and long pants in another, jumpers another, undies another.

Fit neatly in my draw in our Caravan