ccharon/sdwquantumchests

Quantum Chests is a mod for Stardew Valley, made for version 1.6 of the game and installed through the SMAPI modding tool, that adds a new kind of storage chest. These chests are always crafted two at a time, and both chests in that pair share exactly one inventory no matter where you place them, whether they end up on opposite sides of your farm or one is left in the mines. Every time you craft one, you get both halves of the pair at once, permanently linked to each other. Drop an item into either chest and it appears instantly in its partner too, regardless of the distance between them. There are two sizes available: a standard Quantum Chest with normal storage space, and a Big Quantum Chest that holds 70 slots, matching the game's existing Big Chest. Each pair is automatically given a random color from the game's normal chest color options the moment it is crafted, so you can tell different pairs apart even before you place them, and repainting one chest with the paint can tool repaints its partner to match. Visually the chests use the same artwork as ordinary chests and big chests, so the only thing that sets a linked pair apart is its shared color. There is one notable risk built into how the mod works. Simply picking a chest up and moving it behaves exactly like a normal chest. But if one chest of a pair is genuinely destroyed rather than just picked up, its entangled partner disappears too, taking whatever was stored inside with it. The author notes that regular chests already can't be destroyed by bombs or broken with tools, so this situation should be rare, but the mod is built so no orphaned half is ever left behind if it happens. Both chest recipes unlock automatically as soon as you load a save, without needing to reach a particular skill level or complete a quest, though each one costs iridium bars, battery packs, and existing chests to craft. Installing it means installing SMAPI first, then placing the mod's folder into the game's Mods folder. The author notes it should be safe to use alongside other mods, since the underlying code changes are scoped tightly to just this mod's own two new item types.