Multiplayer RPG Inventory System is great for Client-Server or Single player games, supporting picking-up, equipping, transferring, replacing, stacking, and dragging-dropping items.

Marketplace
Demo
Support thread
Documentation

Features:

• fully supported Multiplayer!
• picked up items moved to the Inventory
• move items between slots in one Container or a slot in another Container
• move items from Slots to Containers (not a slot)
• replacing non-stack-able items
• stacking stack-able items
• highlight for available Slots and Containers!
• drag and drop functionality
• fully supported pickup system
• checking items with LineTraceByChannel
• mouse over text on pick-able objects when specific distances are reached
• outline effect for Items
• attachments for the character

Short statistics:

• components = 5
• structures = 4
• widgets = 8
• other Blueprints = 12
• materials = 42
• items = 33
• textures = 38