First u need a Hacket.

Hatchets
You can wield the hatchets to get one more space in your backpack, but in order to do this, you will also need a certain Woodcutting level to wield the axe.

Lvl 1 woodcuttiing
Iron Axe
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Lvl 5 Woodcutting
Steel axe
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Lvl 20 woodcuting
Mithril Axe
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Lvl 30 woodcutting
Adamant axe (get from baby dragon drop)
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Lvl 40 woodcutting
Rune axe (get from baby dragon drop)
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Lvl 60 woodcutting
Dragon axe
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Lvl 1 woodcutting
Evergreen
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Log:
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Lvl 15 woodcutting
Oak
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Log:
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Lvl 30 woodcutting
Willow
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Log:
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Lvl 45 woodcutting
Maple
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Log:
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Lvl 60 woodcutting
Yew
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Log:
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Lvl 75 Woodcutting
Magic Tree
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Log:
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not bad, could show the wc guild too.

and could explain were to start wood cutting

Ya should of i might just do some more guides l8er