add a third-tier bag that is equivalent to all the third-tier bags.
A bag that would therefore have a little more ammunition, an extra grenade, and an extra bandage.
If you think this bag would be too strong.
Add a third-tier bag that would have this effect.
My english is terrible
Your English is great, I understood this just fine. Also I think an all round bag would be a good idea
Nah, your English is fine 
Not sure how something like this would be able to be balanced without abuse. Something I can get behind is something that would give you primary ammo and a small amount of secondary. Say a ālarge bagā that would give you two magazines of primary and a magazine of secondary. Anything beyond something like this I feel would be overkill.
To coincide with the above statement anything more then that may be tricky to implement without having serious issues with balancing and bugs. Thereās already a fair amount of grenade spam as it is, most of the time you get killed before even using your medkits, and a āall in one bagā The combines everything just screams issues even if itās only a single item per type.
Example, standard rifleman Squad with 9 people all rocking the bag that gives +1 Grenade, extra ammo, and +1 medkits. Does this not in itself already seem like a issue? Just imagine what happens when youāre running every squad with every soldier like that, And then to push that point further imagine it being used on every squad for every player on the enemy team. Even if itās a higher tier item above the already existing large bag thatās still going to make something such as BR5 significantly more frustrating to play especially considering weāre already dealing with explosive spam and balancing issues as is.
While I believe they could create new types of bags with a dual functionality It needs to be incredibly limited so it canāt be abused or cause issues later on down the road. So potentially maybe something with more than one type of item in a bag as an event item would help keep things in check, but that would only work for so long before the event comes out again and people start gathering large amounts of them over time. Not every type of bag needs to be combined.
Some valid points here.
But when I think of real soldiers I do question why we are limited to purely more ammo OR more grenades.
Having ālarge ammoā AND 3 grenades would be OP I agree.
But I donāt see why we cant have for example small ammo and 2 grenades. (1 grenade as is default plus 1 more)
Price would be a way to reduce spam of this.
IIRC I think the new price for a large ammo pouch is $400? So maybe one of these special bags could be $1500 or even $3000 each.
I do admit I question when guys seem to have infinite grenades. Like a large grenade pouch gets you three, I take 2 explosive packs and a standard grenade, these wannabes seem to have like 5 explosive packs. Perhaps they just have good coordination as a team.
Maybe add this bag