The Shelly backpack is an Rare Fortnite backpack. Shelly was available via the Item Shop for 400 V-Bucks and you can buy it from Fortnite Item Shop when it will listed.
Fortnite Shelly Skin Details
A little pinch on the back means he loves you.
Fortnite Shelly Skin PNG Images
Here is the PNG images of Shelly below!