Pocket is derived from Poke. Poke is a synonym of Bag. you are likely to find Trash in/at/on Bag. 
Saving is a form of Save. Saving is related to Record. 
Pocket --DerivedFrom--> Poke <--Synonym--> Bag <--AtLocation-- Trash 
Save <--FormOf-- Saving <--RelatedTo--> Record 