These bags only hold items related to Inscription supplies, but are larger than the average general bag.
“Pack of Endless PocketsItem Level 75Binds when equipped32 Slot Inscription BagSell Price: 375...Pack of Endless Pockets
“Inscription Bags are a special type of bag that hold items created by scribes. Sold by...Inscription bag
“The Scribe's Satchel is an inscription bag that will only hold items needed for inscription...Scribe's Satchel