Badminton kit is essential especially if you have more then one racket and don’t like to wear shoe on the road
There are a lot of kit bag available in market but I feel that much cheaper option are available from non badminton companies, I like the Yonex Badminton Kit Bag(check it out on Amazon India )

I have learned it the hard way that always buy a kit bag which has solid shape and not the baggy ones

Yonex kit bag has a solid shape so you won’t have to put extra stuff in it to make it stand at a place
It has two compartments on top and one shoe compartment at the bottom which is more than enough to carry your equipment