serafina , as you know, our EZE - US luggage is legendary in its contents. But our empty bags do weigh 4+ kg each. What brand is your 2kg luggage, and is it well made, to last being repeatedly packed to the teeth?
Mine is not branded. I got two (one medium checked, one cabin) in a rundown mall Abu Dhabi for 60 USD and probably came from India. They aren't as sturdy as the fancy ones, but I don't travel much and I don't care if they get a bump or two. They are just item holders!
One thing I don't like much is that the lock is not very sturdy. It is just a combination. And anyone with a knife could tear along the zip. You can use a TSA strap lock for extra hold. I always forget to put on mine, though!
My set looks like these white ones below, more or less. The ones in the picture below are available on Amazon.com for 134 USD (the set of three). I don't remember the exact weight of mine, I didn't pay much attention when I bought them as I bought them for the look/different kind compared to my old-style extra-sturdy and heavy Samsonite.
My mom gave me that Samsonite for my 19th birthday. It was meant for medium-range trips in Europe. Since moving to Argentina, I got to know the pleasure of larger bags. I didn't buy the largest bag (28") because I wasn't sure it was fit for Europe-Argentina flights. I know that in Asia they have a larger allowance in terms of baggage weight and size. I don't need more volume, as I can pack very tightly. My concern is always the weight.