Unlike regular Minecraft, in Minecraft Earth the inventory was effectively unlimited, both in inventory slots and the stack size of items or blocks. When a stack of items exceeded 999 in quantity, it was displayed in multiples of 1000; for example, 1,273 items displayed as "1.3K".
There was no inventory crafting grid, so it wasn't possible to repair damaged items by combining them. The inventory also had no armor slots.
Mobs were able to be collected in the inventory, and achievements were earned for collecting them. On rare occasions, a tappable dropped a hostile mob that was able to be collected and placed on a build plate.
Unlike regular Minecraft, identical tools stacked in the inventory. Any tool that had been used so that its durability was reduced, was removed from the stack. Empty buckets stacked also, but filling one with water, mud, or lava caused that bucket to move to another stack corresponding to the bucket type.
Stacks weren't able to be split, except for stacks of tools split up due to tool usage. A partial stack of blocks weren't able to be moved from the main inventory to the hotbar; only the whole stack was able to be moved. If a player has, for example, 37 cooked chickens in the inventory and wanted to bring chickens on an adventure, then all 37 cooked chickens were moved to the hotbar, risking the loss of the whole stack if the player died during the adventure.
Minecraft Earth actually had two inventories; the main inventory and a "backpack" inventory that was used during adventures.
During an adventure, the main inventory was inaccessible. The player was able to move items from the inventory into the hotbar at any time outside of an adventure and was given the opportunity to do so just before the adventure began. During an adventure, opening the inventory showed only the backpack inventory, which contained only the items collected during the adventure along with the contents of the hotbar.
Collecting items filled empty slots in the hotbar first. If the hotbar was full, subsequent collected items filled the backpack inventory.
If the player completed the adventure without dying (either because the adventure duration expired, or the player exited manually), all items in the backpack were transferred to the main inventory. Items that collected in empty slots in the hotbar remained in the hotbar, and were able to be transferred manually to the main inventory as the player desired.
If the player was killed during an adventure, the player's main inventory was retained. Only items in the hotbar and backpack were lost.