DO NOT believe that this reduces weight on its inventory. As of today AUG 2020 I tested stacks of meats and berries etc, IT DOESNT. But instead it increases spoil timer of foods, meats and berries on its inventory. ⬆️ to prevent ppl from false informations!
Weight: Jerboa's total weight is HALVED on your shoulder. Ex. Let's say your crystal is 80 weight. If you have jerboa hold the crystal and put him on your shoulder it would weigh 40. Check top utility comment for his weather prediction!