After a misadventure or two (chronicled here), I started carrying an emergency canvas supply bag with me all the time. A canvas bag has 27 slots. In it I carry:
- 10 obsidian, for a portal out of the Nether.
- A mystcraft book back to my base (I also have one on my hotbar, but a backup is incredibly important.)
- A stack of wood, for many purposes.
- A stack of charcoal for torches/fuel.
- A stack of flint, for arrows and in combination with iron for flint & steel to activate a portal.
- A stack of iron, for armor/tools.
- A stack of string, for bows/fishing poles/wool for a bed/bee scoops.
- A stack of books, for Mystcraft purposes.
- A bucket of water (1)
- A bucket of water (2)
- A stack of steak.
- A fire resistance potion (1)
- A fire resistance potion (2)
- A fire resistance potion (3)
- A remote orderer (logistics pipes.)
- An ender pouch (To input chest to my sorting system.)
- An ender pouch (To output chest for my remote orderer.)
- A minium stone (for multivarious purposes.)
- A silk touch enchanted pick.
- A silk touch enchanted pair of shears.
- A few blank soul shards.
- A blank maze/ore map.
- An electric Jetpack (backup).
- An Advanced Lappack (for recharging electric items with the MFSU.)
- An MFSU.
- An electric wrench (To pick up the MFSU again.)
- A prototype omniwrench.