Netherite Backpack

Three rows, 27 slots, the size of a chest, plus three charm slots.

It is made at a Smithing Table, not in a crafting grid: a Netherite Upgrade as the template, a Leather Backpack as the base and a Netherite Ingot as the addition. The contents, the charms and the dye carry over.

Lying on the ground as an item, it is not destroyed by fire, lava, cactus or explosions. That matters when you die near lava: the canvas and leather tiers burn like any other dropped item.

Wearing, opening and charms: backpacks and charms.