
Increasing the size of your backpack in Creatures of Ava is essential due to how many plants and potions you'll pick up while running around. But, to do so you'll need to know the backpack pocket locations around the map. There are six pockets in total to collect, spanning three biomes, so you won't be able to get them all right away. However, once you've got a hold of a couple you'll be able to make more space for your goodies to tide you over until you can find the rest.
You can unlock the first bag increase with two backpack pockets which can both be found in the grasslands where you start. After that, you'll need four additional pockets to upgrade your backpack with another five slots. These are scattered throughout the grasslands, jungle, and swamp. To make it easier for you, I've pinpointed on the map exactly where to find each backpack Pocket to save you trekking aimlessly.