You can get the pouch of extra knives at any tailor shop.
The extra large pouch is free.
The extra large pouch should give you the ability to carry 25 Throwing Knives instead of 20.
- Altair Skin
Get the skin at any tailor shop
Go into the Animus Desktop (pause menu)
Go into Inventory/Outfits
Select the Altair Skin (last selection)
- Auditore LGS
Once SQ05 is loaded, you can go directly to Monterigionni
The LGS is located at the Assassin icon position on your map