In Rust, the default item stack limit is 100. If you wish to increase this, you will have to use an Oxide plugin.
This article assumes you already have Oxide installed. If you need help with installing Oxide, you can find our tutorial here.
In this example, we will increase the stack limit to 10,000. To do this, you can follow these steps:
Download the Stack Size Controller plugin, located here. The file should download as StackSizeController.cs.
On your control panel, navigate to Files > FTP File Access and log in using your control panel password.
Upload StackSizeController.cs to /oxide/plugins and restart your server.
Connect back to your server. The Stack Size Controller plugin is now loaded.
Press T to open chat, and type /stackall 10000
You can now stack all items up to 10,000. This can be configured to your liking.
You can also configure specific items. More commands can be found on the plugin's website.
Updated on: 11 / 03 / 2020