#5 Jerry Can
A Jerry Can also goes on the top tube but it butts up against your seat post. They’re typically smaller than a Gas Tank. They are great for tools and other items you might want easy access to.
#6-8 Other Bags
There are various other bags available for bikepacking. They include fork mounted, down tube (tool or tube pouches), feed bags, handle bar, and of course you can use a hydration pack too.
Fork mounted bags are just small stuff sacks that mount to your forks. Salsa and other companies makes special bottle cages to hold these bags, fuel bottles or whatever else you can fit on the cages.
Not as common are Down Tube bags. People with full suspension bikes somethings use these to make up for the lack of front triangle space. They’re usually low profile and narrow, more of a roll than a bag. These are great for storing tools to keep the weight low on your bike.
Feed Bags go behind your handle bar next to the step. Like Gas Tanks they’re great for items you want easy access to. Bottles, cameral snacks or ever a jacket.
Some companies sell additional smaller bags that attach to your Handle Bar Roll/Sling. Like Gas Tanks and Feed Bags, these auxiliary handle bar bags are great for easy access, and they’re typically easy to remove which means take your valuables with you when you leave your bike.