How much time does putting an item inside a Bag of Holding take when you are fighting?

Question

In the Bag of Holding's (Dungeon Master's Guide pag. 248) description it is stated:

Retrieving a specific item from a bag of holding is a move action — unless the bag contains more than an ordinary backpack would hold, in which case retrieving a specific item is a full-round action.

I am wondering how much time is required to put an item inside the bag while you are engaged in a combat encounter. Should it be considered as a move action as well? Should it be a free action if the item is small enough?

I have found this question that is almost the same as this one: How long does it take to place an item in a Bag of Holding or Portable Hole?

The only thing that has not been made clear is: does the item's size influence the time I must spend to put something inside the bag?

Ex: Does a rod take more time than a ring? What about an halberd and a sword?

Answer 1

It’s a move action:

Manipulate an Item

In most cases, moving or manipulating an item is a move action.

This includes retrieving or putting away a stored item, picking up an item, moving a heavy object, and opening a door. Examples of this kind of action, along with whether they incur an attack of opportunity, are given in Table: Move Actions.

^{(Actions in Combat → Move Actions, emphasis mine)}

MOVE ACTION

A move action allows you to [...] stow a weapon or other item

^{(Rules Compendium pg. 7)}

Nothing in the description of bag of holding suggests that stowing an item would take a different amount of time, and no rule mentions item size having any effect.

Less clear is whether or not this process provokes an attack of opportunity—it almost certainly does, since everything else about manipulating an item that isn’t “draw a weapon from a sheath” does—including sheathing a weapon again. But neither the core rules nor Rules Compendium comes out and says this.

The other issue to keep in mind is that the move action to stow an item in a bag of holding requires that the bag itself be accessible. The rules for this are very vague, and it’s basically up to the DM—you’re definitely OK if the bag is in your hand, or say, on your belt. Conversely, if your bag of holding is inside another container, that will definitely require more to retrieve the bag before you can stow anything in it. If it’s on your back, though, that’s much less clear—you may need to spend a move action pulling it off your back first, and then spend another move action actually putting your item into it. That call is just up to the DM in each case.

Answer 2

Nothing in the rules states the size of an item affects the (normally, move) action to put an item away, so typically, the size doesn't affect it. Putting items into a bag is never a free action - you have to look down, grab the bag from where you've got it, open it, put the item in, close it back up tight, and put it back where you keep it - I'm surprised it's just a move action, honestly.

Of course, an individual DM may change the storage time for items that can only be put away like because you have a physics-defying bag. If they want to make it a standard or full-round action to put away a 10-ft pole or a ladder, that's reasonable, but by default rules, it's just a move action.