You can get free Backpack skin from the Future Leap event that is currently underway.
Battlegrounds Mobile India was launched for Indian players on 2nd July 2021. BGMI is developed by Krafton, a South Korean game developer. The 1.5 update came featured a new Ignition mode, revamped buildings, Tesla car, to name a few changes. Brand new skins of Tesla cars and Cybertruck were also added to the game. BGMI is offering a permanent skin for a backpack for free in the newly introduced event.
The main purpose of a backpack is to help you store loot like first aids, bandages, energy drinks, gas cans, ammo, and more. Players use the backpacks in every game and having cute skin just makes the bag look nice. Players need to spend UC (in-game currency of Battlegrounds Mobile India) to get the cool permanent backpack skins. But there are always other ways to get it for free.
You can get free Backpack skin from the Future Leap event that is currently underway. The event will end on 11th August, you have enough time to get the skin for free.