Backpack T1
Backpack T1 is available immediately, adds four inventory slots, and has a listed recipe of two Iron.
How it works
The equipment guide lists Backpack T1 as available immediately and says it adds four slots for a recipe of two Iron. It describes the backpack as part of a line that increases inventory capacity. The guide also states that each backpack upgrade requires the finished previous item as an ingredient. The older starter guide independently describes crafting a bigger backpack early without listing its slot count.
Read the supporting references
A focused reference to six equipment families in the supplied version 2.103 guide: oxygen tanks, backpacks, jetpacks, agility boots, exoskeletons, and hand-tool mining speed chips. It records reported effects, tier ranges, and selected recipes or unlocks. The guide's version and claims are not independently verified. Guidance explains the referenced mechanics; it is not a tested damage ranking. Check the stated edition and source version before applying a patch-specific detail.