soundsmiiith the soldier maaaiin

Not necessarily, twice is tops. You can survive without a chute, you just break your legs

how the hell you gonna survive falling 2km from the sky?

Look it up on YT
Summarized:
Assuming both your main and backup fail, you wanna spread out into an X formation to maximize drag. Then, look for the following:
Swamp
Snow
Trees
Your best chance of survival is to land in one of those three. However, DO NOT LAND IN THE WATER. At about 900 feet (just guess) Pull yourself into a position where your legs will absorb the impact, and get into a position like a somersault to protect your head and neck. You will break your legs, but this will give you like an 80% chance of survival.