What is a good gopro case to get if you dont know what accessories you will be getting?

i am going to order a gopro 4 silver next week with a smatree battery 3 battery charger with 2 batteries (i might order the 2 pack of batteries to go with that charger in the future), a head strap and hat mount, tripod adapter. I already have a mono-pod and some tripods but i have a bag for the tripods already but it would be good of i could get the mono-pod in with the gopro since my tripod bag is quite full. I have a camcorder and a point and shoot camera which i have a bag for and an actioncam ( this has parts that are compatible with a gopro that i might use with the gopro) in a plastic pouch.

i am on benefits (before you insult me i am too ill and disabled to work im not just lazy i would like to work) so it cant cost that much. It needs to fit well in a suitcase since i do a lot of filming when i go on holiday.

the zip would have to be able to open and it would have to be easy to get the components out.

it would be best if i could get it off amazon uk.
Added (1). i have had to save up for the gopro so im not spending my benefits on it
Added (2). my monopod goes don to around nine inches

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