Magic notepaper is a reward from Treasure Hunter and clover necklaces, and can be purchased with 500 thaler for 100 magic notepapers. When an item from inventory is used on magic notepaper, it will instantly convert that item (and any identical items) into notes, thus allowing the items to stack. Doing so will consume 1 magic notepaper per item in the process.
Abyssal Demon Guide (Slayer Tower) : r/runescape
Killing green dragons, RuneScape Wiki
Runescape 3: Useful Items: Magic Notepaper
Notes (A-L) - The RuneScape Wiki
Brandy Trout Facebook, Instagram & Twitter on PeekYou
Note, RuneScape Wiki
Collecting limpwurt roots, RuneScape Wiki
Killing nightmares - The RuneScape Wiki
Cannot note muspah spines with magic paper. : r/runescape
Penance master horn, RuneScape Wiki
Finding Zamorak mjolnirs - The RuneScape Wiki
Killing spiritual warriors - The RuneScape Wiki
Probably already been noticed - but Sheldon is using the Mordaut
Enchanted notepaper - The RuneScape Wiki