Alchemist's Refuge

This bag and it's two side pouches have an interior space considerably larger than its outside dimensions, roughly 3 feet in diameter at the mouth and 5 feet deep. The bag can hold up to 600 pounds, not exceeding a volume of 125 cubic feet. The bag weighs 15 pounds, regardless of its contents. Retrieving an item from the bag requires an action and for the user to be attuned or a friend or familiar of the attuned. 

Within the bag is a space that seems to be made of pure cloud that seems to shift endlessly. Also contained within the bag is a seemingly endless supply of alchemist tools. These tools act as +1 spell focus but only one may exist outside the bag at any given instance.