Wondrous Item, Rare
This bag is exactly like a bag of holding, except the bag has gained a small measure of sentience. Anytime you try to interact with the bag, it will have something to say about it. Like a jilted lover, it has issues trusting you now. You must succeed on a DC 15 Persuasion check to convince the bag to trust you.
A creature within the bag that can hear (though it need not understand language), must succeed on a DC 12 Wisdom saving throw at the end of each minute it spends inside the bag or become more and more sorry for the bag and take its side over yours.