Together we have written here the thread
"How light is lightweight?".
(Perhaps someone else is able to set the link below here, so that you can find it easily.)
There I gave some examples how it's possible to reduce weight and volume of the packed rucksack.
I wrote there mainly to inform strong students, paying attention, that the prices do not climb to high.
If people are able to invest a bit more money, it's possible to use even lighter equipment in the summer.
Now a days it is easily possible to get a modern summer hiking equipment in a 30 litres ruck sack with a total weight of round about 4 kg. (plus water and food).
If you like, you can read that threat first, but later I can recommend you more items for such an incredible light equipment, that fits exactly to your measures and planed hikes.
There are one person tents of round about 400g on the market, one person pots of around 100g, gas stoves of 25g, sleeping bags with a weight of 600g and so on.
Experienced people who are able to pay a bit more, now a days can use incredible light equipment.
What they use in the NASA is nothing against modern hiking equipment!
If you are interested in this, I offer you to help you with things like this, I am not so bad informed about modern stuff.
But I learned with old stuff from the eighties, Wehrmacht and even older, so I can imagine, where you come from.