The Phrozen Keep hosts several UI plugins that expand the sizes of the player inventory, stash, and Horadric Cube. These can be dropped in and used in your Diablo 2 mod right away. Here's a rough comparison of several inventory plugins for D2 1.10+.
Mega Inventory Stash Cube (v1.10s & v1.10 Final)
This plugin increases the inventory, cube, and stash sizes while preserving the overall layout.
- Inventory: 10x6
- Cube: 10x8
- Stash: 10x10
