Well, it says it takes an action to pull and throw ONE fuzzy ball. So, you could never throw all three at once.

What happens if my players put something inside the bag?

Had given our rune knight fairy a tan bag of tricks. He rolled Tiger and casted enlarge on it. They they then had a 20 foot long 6 foot tall tiger. He then used Giant's might and rode it into combat. He activated it right after dawn so it lasted for 24 hours.

Pull out two creatures and have them follow you (only until dawn ofc; or just spawn them if you know a fight will happen). Once a fight starts use a twinned Polymorph on both and command them every turn to attack with your bonus action. Legit?

So in my campaign play throws the ball and makes a bear. Druid wants control of the bear for his own purposes so he casts charm animal on the bear? Argue starts.  Can it be charmed like a bear? or is it magic and not a real bear? 

So it says it’s transforms into a creature so it would act as a creature, I would assume. However, it can still be commanded by the person who pulled it from the bag. So even if the druid charmed it, the person that summoned it could use a general command to ignore the druid. The item is designed to give player a bonus to their own actions/bonus actions. The creature cannot be forced to act against the one that summoned it.
However, this sounds like player conflict, which you as DM likely want to establish a rule, do you allow players to steal from one another? If so then this is the same principle albeit with the original summoner able to counteract the druids charm  

Quote from Masser12 >>

So in my campaign play throws the ball and makes a bear. Druid wants control of the bear for his own purposes so he casts charm animal on the bear? Argue starts.  Can it be charmed like a bear? or is it magic and not a real bear? 

Quote from Khylar92 >>

Pull out two creatures and have them follow you (only until dawn ofc; or just spawn them if you know a fight will happen). Once a fight starts use a twinned Polymorph on both and command them every turn to attack with your bonus action. Legit?

 You can only command one per bonus action, per the description of the item. The bonus action refers to a singular creature, not all summoned creatures. This command is also only for what to do on its next turn, not the rest of the encounter.

One of the best used I’ve found is to be a rogue, use a grey bag and hopefully get a weasel. Then hold the weasel on your shoulder or somewhere on your person and always have it’s turn be to help you in combat. You’ll get advantage on your attacks and them you can literally sneak attack every single turn.

Love this item. First; it can be thought as a (lesser) find familiar. Second certain classes really shine having this item. 

A 2nd level druid getting their hand on a Gray bag of Tricks now has a way to learn 6 wild shapes.(all 1/4 CR or lower.) Moon Druids would also benefit from the CR 1&2 creature.

For a mounted character (Fight, Paladin) the Rust bag of tricks offers the most large sized mounts, two beast of burdens or two effective combat creatures (owl for bypass and Rat for scouting)

The tan one is a mixed bag (pun intended) however with two creature having pack tactics, two with opposing thumbs, two with multi attack, and a range attack. A Rogue benefit from the pack tactics, and a climbing speed to carry a climbing rope for you.

I feel bad for you as a player, makes this bag clearly so much less fun and usefull. You can still use them as meatshield but I would never ask a BA each turn if it says you can give a GENERAL order. I think you're right but DM has always the last word. She just decided to pick the less fun. 

I'd play it like it reads in the description. But DMs have discretion to interpret/change the rules as they see fit. Some folks are sticklers for rules as written. Others want to impose their interpretations or preferences. Personally I think she's making a rule change for no particularly good reason, but it's not my table. 

you can command them all with one bonus action

I made a custom for a campaign her are the stats 

Bag of tricks

Roll a d8. Depending on the number rolled, one of the animals listed below is summoned.

1. Weasel
2. Owl
3. Badger
4. Axe Beak
5. Giant Goat
6. If a 6 is rolled the dm must roll a d4 if it lands on a 4 it is a wish chicken if not it is just a giant weasel.

1. Dire wolf
2. Giant Elk 

Side note if a wish chicken dies it gives its owner a wish

Bag of tricks

Roll a d8. Depending on the number rolled, one of the animals listed below is summoned.

1. Weasel
2. Owl
3. Badger
4. Axe Beak
5. Giant Goat
6. If a 6 is rolled the dm must roll a d4 if it lands on a 4 it is a wish chicken if not it is just a giant weasel.

1. Dire wolf
2. Giant Elk 

Side note if a wish chicken dies it gives its owner a wish.Can only be used twice a day

Quote from Edgebeast >>

Quote from ShiKhali >>

having a huge disagreement with my DM about this item. its her first time DMing and she says i need to issue the attack order every turn for my summoned creature taking my bonus action each turn. even if the target is the same and a general order of "attack that target continuously" has been given. and despite the expressed written rule "You can use a bonus action to command how the creature moves and what action it takes on its next turn, OR to give it GENERAL orders, such as to attack your enemies."

i say that this isnt an animal companion. i dont have a connection to it, it just pops into being and disappears later. it is a summoned animal with its own turn that is taken on the summoners initiative. ie. will continue with whatever orders it been given unless unable to or given other orders.

the rules as stated for this item and how I'm understanding this is
"The creature is friendly to you and your companions, (knows friend from foe) and it acts on your turn. (using your initiative number) You can use a bonus action to command (overwrites action to command attack for animal companion already clearly making this different from an animal companion) how the creature moves and what action it takes on its next turn (clearly defining that the creature has ITS's own turn), or to give it general orders, such as to attack your enemies.(not "attack that enemy once") In the absence of such orders, the creature acts in a fashion appropriate to its nature." (would likely attack an active threat to known friendlies.)

she is stating that regardless what the rules of the item say the rules for a ranger's animal companion (despite me not being a ranger) supersede what is written for the item. and that im lucky shes letting it use a bonus action to attack each turn as if that isnt part of the items rules. despite it never being mentioned in item description of giving you an animal companion. but rather specifically labeled as summoning a creature.

she was willing to homebrew it to just roll the animals own initiative when it comes out so it has its own separate turn and that would in effect be the same thing as what i understand the rules say to do, except a little off time and harder to manage. but im curious what other DM's would rule. kinda wish this was like MTG where you could see official rulings of how items work. because I feel like word usage tends to be very specific about what they are saying. and given her ruling it turns the bag of tricks into a bag of goldfish with a 6 second memory that'll just stand there like idiots waiting  for me to say "ya thats still an enemy, didnt change in the last 6 seconds go ahead and bite again" taking away the opportunity to cast a  healing word

 First you are kind of pushing rules lawyer boundaries here. Whatever your DM says goes. Second I believe that you do have to use your bonus action every turn to command the animal to do something otherwise it will do what it's instincts say. Say your fighting enemy soldiers, an animals natural instinct would not be to attack said soldier. Instead it would run away. The only reason the animal would attack that soldier in the first place is because you told it to. This item isn't really here to give you free damage its here to give you something to use your bonus action on for a little extra damage. If you want to cast healing word then you don't get the extra damage from said animal.

 I have to disagree with you.  While yes "what the dm says goes"  This item already has a description about what happens if you issue no order. "acts in a fashion appropriate to its nature."  So if you have a tiger.....for example...it's nature would be to attack something that it doesn't see as friendly.   This is one of those situations where the DM is, understandably, wrong.  Obviously the game has a  LOT to take in, and a DM cannot be expected to know everything.   

I didn't know that one of my players had this and was wildly unprepared for her to pull a dire wolf on me. Safe to say thati have a copy of the sheet now for less surprises 😂

The Gray Bag of Tricks has been really useful for me with so many fun encounters. I got a weasel who bit into a troll's ankle and when the troll ran around smashing us, the tenacious little weasel was just along for the ride until the troll fell on it. I got a dire wolf that was too big to climb upstairs in a tower to check if it was safe, so we squeezed it into the basement  instead where it met its end with a mimic. And epically I got the giant elk in a bossfight and it survived. But when the boss died, the room shrunk so we got squeezed pretty tight together in there. Couldn't get out so I had to do a mercy kill on the it so we could be free, the poor beastie.

Quote from Abelhawk >>

Description says gray but the table title says grey. Remember, in America it's gray, in England it's grey.

 It just says Gray for me. 

I have another use for it infinite food supply