Burlap Sack is a simple mod which adds a Burlap Sack to transport animals and villagers. Hostile mobs cannot be transported in a Burlap Sack.
Images:
A Burlap Sack transporting a llama
A Burlap Sack transporting a chicken named Greg
A Burlap Sack transporting a villager
Crafting Recipes:
Burlap Fabric crafting recipe
Burlap Sack crafting recipe