Knapsack

Quest: 36 Slots Ain't Enough ''The knapsack goes into your Tinkers' Construct inventory, the Diamond Chestplate tab at the top. It gives you another tab that allows you to store a small chest's worth of items in it. The knapstack is useful for many things. You can store food, torches, or pretty much literally anything else.''

Crafted with 6 Leather, 2 Iron Tough Rods, and 1 Gold (or Aluminum Brass) Ingot