Q:
Leather Pack - Oiled vs Rugged
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Oiled Leather Pack prioritizes junk items filling up its slots first and Rugged Leather Pack is just your standard bag.
There is also an invisible leather pack. It doesn’t show up in the vendor list when you go to vendor items. Really useful for extra weapons and crafting mats you don’t want to accidently sell. I think it requires dust instead of the bones..
Linwe ~ 80 Ranger | Clibni ~ 80 Guardian
Stormbluff Isle ~ Knights Templar
Stormbluff Isle ~ Knights Templar
Just to expand on what the others said, there are several “specialized” bags and boxes that can be crafted by Tailors, Leatherworkers and Armorsmiths in addition to ordinary ones. The specialized ones, like Oiled packs, must be discovered at each level.
Check out the list on GW2 wiki.