So your druid could be wearing hide armour and carry a staff and wooden shield, and various pouches and such, and that would all merge into the form if you wild shaped into a rat or a bird, and that's fine. But if you carry a backpack with 25lbs of gear in it, would that also merge? What if you had a custom heavy pack that could carry 100lb of gear on your back? Or what if you just pick up the backpacks of everyone in the party before you wild shape into something light and tiny? These are examples to clarify what I'm asking with my main title question.

Is there any limit given?