dnd 5th – How long does it take to place an object in a storage bag or portable hole?

The descriptions of a holding bag and a portable hole are very precise about the time it takes to retrieve items, but give no indication of the time required to place an item at the same time. # 39; inside. Handy Haversack's description, on the other hand, specifically indicates that placing an object in it requires your interaction.

So, if my character wanted to place an object in a holding bag or a portable hole in the middle of the fight, would he need an action, an interaction of object or something else? # 39; other?