Can i fit my Canon t3i, 18-55mm, 50mm, 55-250mm, AND rode mic in this bag?

I have two of those lenses in my bag and I'm sure you can fit the other one. And I don't know what rode mic you're referring to but I'm pretty sure you can. You can even store two of the smaller lens on the side pockets if you had to.

I have a canon rebel t3i can I leave the 18-55 lens on it and store it in the bag or do I have to remove lens to fit in bag?

You can, by rearranging the dividers, but, it won't leave a lot of space for other lenses. IF you have more lenses to take with you, then I would spring for the Canon 200DG instead. It has more interior space and more storage pouches too. For more info about the 200DG, you should check out the review I have on my profile, or just follow this link. https://www.amazon.com/gp/customer-reviews/R1THEGIQ7DYCOM?ref=pf_ov_at_pdctrvw_srp

Could it hold the following? 1 camera;1 battery pack; i flash; 5 lens; bracket; cord; credentials; cleaning kit; ?

My bag I have the camera with a 18-135mm lens mounted face down, flash 580ex in, a 50-250mm, and I has the same to hold about 2 more comfortably inside on the outside pocket I have the charging cable with extra battery a day in other pocket I have cleaning kit I think with the 5 lenses would be pushing it I say 3 more realistic depending on size

ASIN	B0002Y5WZM
Best Sellers Rank	#8,492 in Camera Cases
Brand Name	Canon
Closure Type	Zipper
Color	Black
Customer Reviews	4.5 out of 5 stars 2,000 Reviews
Global Trade Identification Number	00750845111378
Handle Type	Web Handle
Included Components	Bags & Cases:Camera Case
Item Type Name	Canon 7507A004 Gadget Bag Camera Case, Black
Manufacturer	Canon Cameras US
Manufacturer Warranty Description	1 year warranty
Material Type	Nylon
Number of Compartments	5
Pattern	Solid
Strap Type	Adjustable,Shoulder Strap
Style Name	Mesh
UPC	750845811377 069060036138 778890806360 750845111378

Canon 2400 SLR Gadget Bag for EOS SLR Cameras

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