Bag of goblins

This bag has an interior space considerably larger than its outside dimensions, roughly 2 feet in diameter at the mouth and 4 feet deep. The bag can hold up to 1000 Goblins, and as little as 25 goblins, not exceeding a volume of 64 cubic feet. The bag weighs 15 pounds, regardless of its contents. Retrieving an Goblin from the bag requires an action.

If the bag is overloaded, pierced, or torn, it ruptures and is destroyed, and its contents are scattered in the Astral Plane. If the bag is turned inside out, its contents spill forth, unharmed, but the bag must be put right before it can be used again. 

 Can be upgraded it starts at level 1 and goes to 5

1: 25 Goblins
2: 50 Goblins
3: 250 Goblins 
4: 500 Goblins
5: 1000 Goblins

The personality of the goblin drawn is determined by the roll of d10 1-9 is an alignment and 10 is dm choice

its price for upgrading is up to dm discretion but it usually follows the magic item pricing in the dmg but ask your dm

Notes: Utility, Container