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Freshness-Preserving Upgrade

The original mod upgrades containers like refrigerators into freshness-preserving and reverse-aging containers
(Modified version allows upgrading more containers including: Regular Backpack, Piggy Backpack, Insulated Pack, Krampus Sack, Seedling Satchel, and Chester. This mod is an extended version that supports upgrading additional container types).

By default:

Use Sapphire to upgrade for permanent freshness

Use Rainbow Gem to upgrade for reverse-aging functionality

Reset function is disabled

If this is too challenging, you can adjust the settings to use Twigs instead.

（Note: Terminology like "reverse-aging" preserves the core mechanic description while "freshness-preserving" maintains consistency with common modding terms. Container names follow official/localized item names.）