January 2021 - last edited January 2021
@Cheese9ManNo they are not. The packs are RNG based. When you open a pack it stops the RNG.
Basically each item in the game is given a number. The RNG cycles through the number sequences, when you open the pack it stops the RNG producing a number sequence. It then gives you the content based on that number sequence. So if Bangalore Spacewalker skin is let's say number 299 and the RNG is stopped on 299 you will receive that skin. If you already have it, the game just automatically gives you crafting materials.
That is how they calculate the odds and percentages of what's possible. Basically just total up all the possible outcomes use that number to divide the total number of legendary items and move the decimal over 2 places. You have the percentage.