My Time at Sandrock

To increase the backpack inventory size in My Time at Sandrock, open the Inventory screen and click on the very last slot with the plus symbol. A window will appear, granting players the option to spend Gol to unlock backpack slots. You have a maximum of 40 backpack slots for the first tab. As you continues adding slots, the price will gradually increase.

• It costs 10 Gols to add one inventory slot for the first 11.
• 20 Gols for 12 through 21 slots.
• 50 Gols for 22 through 31 slots.
• 100 Gols for 32 and above

I found it very useful to invest gols for backpack size expansion. Mainly because you'll go mining for an entire day and it's important you can carry all the goods back home. So keep investing in the slots, untill the achievement pops.

The best way to make Gols is accepting Commissions at the Commerce Guild. (choose the highest Gols reward ones)