Can I combine small seed satchels?

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Looked everywhere for this simple question.
I have 2 small seed satchels, is there anyway to combine them into one, so that there would be a +20 bonus. Or do you just upgrade one, and sell the other?
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How many small seed satchels can you buy?
In Skyward Sword, the Small Seed Satchel is obtained from Bucha along with the Slingshot and can hold 10 Deku Seeds. Two additional Small Seed Satchels can be bought, but they take up slots in the inventory.What is the small seed satchel in Skyward Sword?
The Small Seed Satchel is the most basic form of the Seed Satchels that Link can use to carry additional Deku Seeds in Skyward Sword. Small Seed Satchels can be bought from Rupin's Gear Shop in the Bazaar. Each Small Seed Satchel can hold an extra 10 Deku Seeds, and takes up one slot in the Adventure Pouch.What are the seeds for in Skyward Sword?
The Life Tree Seedling is a small tree seed from Skyward Sword that eventually grows into the Tree of Life. This seedling, when fully grown into a tree, produces a fruit that can heal illnesses. The Ancient Robots planted the seed in hope to heal their leader, Lanayru.How do you plant seeds in Skyward Sword?
How to Plant the Life Tree Seedling in Skyward SwordTips for Sowing Small Seeds – Everything You Need to Know
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