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.
Research notes - The RuneScape Wiki
The auto-noter: Stores magic notepaper and then use it on an item
Brandy Trout Facebook, Instagram & Twitter on PeekYou
Marketplace - The RuneScape Wiki
Killing spiritual warriors - The RuneScape Wiki
How do people make money : r/runescape
Potion Pandemonium - The RuneScape Wiki
This must be a common problem but how do you deal with this? : r
Probably already been noticed - but Sheldon is using the Mordaut
Bloody notes - OSRS Wiki
Runescape 3: Magic Notepaper
Brandy Trout Facebook, Instagram & Twitter on PeekYou
PSA: You can change TH settings to automatically redeem lamps