Will it fit a Canon M50 body with three lenses (15-45mm, 10-18mm, 55mm), and an adapter?

Not that big. Might fit 2 of the lenses, but probably not 3.

will it fit the olympus em-10 mark iii with 3 small primes (17, 25, 45)?

You should compare measurements of your camera to case, but i believe so. It holds my powershot SX 60 HS which is bulky, dimensions of 5.02 x 3.65 x 4.50 in. It comes with 2 dividers. On both the top half has an indention so it will fold over to cover the bottom item while stacking another item. It's a small case, but very well padded. top zips completely closed.

ASIN	B01EJPYQ7O
Best Sellers Rank	#44 in Camera Cases
Brand Name	FOSOTO
Capacity	12 Liters
Closure Type	Zipper
Color	black
Customer Reviews	4.6 out of 5 stars 5,535 Reviews
Handle Type	Web Handle
Item Dimensions L x W x H	7.8"L x 4.3"W x 5.9"H
Manufacturer	FOSOTO
Manufacturer Warranty Description	1 Year
Material Type	Nylon
Number of Compartments	2
Pattern	Solid
Strap Type	Shoulder
UPC	747380357668

OHEDMEH JY-A56

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