Traveler's Backpack Simple Upgrading

Evidence

Ran on Kiln's test stand (2026-11-04): TravelersBackpackSimpleUpgradingFabric did not start: java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager; TravelersBackpackSimpleUpgradingFabricClient did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/recipe/v1/sync/RecipeSynchronization.

What it needs from Kiln

• Mixin
• net.fabricmc.fabric.api.recipe.v1.sync.RecipeSynchronization
• net.minecraft.nbt.CompoundTag
• net.minecraft.network.codec.ByteBufCodecs
• net.minecraft.network.codec.StreamCodec
• net.minecraft.world.item.ItemStackTemplate
• net.minecraft.world.item.crafting.CraftingInput
• net.minecraft.world.item.crafting.CraftingRecipe
• net.minecraft.world.item.crafting.CraftingRecipe.CraftingBookInfo
• net.minecraft.world.item.crafting.Ingredient
• net.minecraft.world.item.crafting.NormalCraftingRecipe
• net.minecraft.world.item.crafting.PlacementInfo
• net.minecraft.world.item.crafting.Recipe
• net.minecraft.world.item.crafting.Recipe.CommonInfo
• net.minecraft.world.item.crafting.RecipeSerializer
• net.minecraft.world.item.crafting.ShapedRecipePattern
• net.minecraft.world.item.crafting.SimpleSmithingRecipe
• net.minecraft.world.item.crafting.SmithingRecipeInput
• net.minecraft.world.item.crafting.TransmuteRecipe
• net.minecraft.world.item.crafting.display.ShapedCraftingRecipeDisplay
• net.minecraft.world.item.crafting.display.SlotDisplay
• net.minecraft.world.item.crafting.display.SlotDisplay.Empty
• net.minecraft.world.item.crafting.display.SlotDisplay.ItemSlotDisplay
• net.minecraft.world.item.crafting.display.SlotDisplay.ItemStackSlotDisplay
• net.minecraft.world.item.crafting.display.SmithingRecipeDisplay
• org.apache.logging.log4j.LogManager
• BuiltInRegistries.RECIPE_SERIALIZER
• ItemStack.applyComponents()
• ItemStack.get()
• ItemStack.getComponentsPatch()
• ItemStack.getOrDefault()
• ItemStack.has()
• ItemStack.set()
• Items.CRAFTING_TABLE
• Items.SMITHING_TABLE

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Mixin (0.5)

In the author's words

Upgrade your backpack easily in the crafting table - no smithing required!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file travelersbackpacksimpleupgrading-fabric-26.3-1.0.0.jar. The scan reads the mod's classes; it does not run them.