seat post bag

Looking for a seat post bag quick release big enough for all me bits when I park me bike up . My speedo, little pump little lights a tube and tyre levers poss little jacket.... anyone recommend a good one that holds a decent amount. Maybe quick release too
Have looked at the trek botraga pro pack quick release ones are these good for the money. Can you fit plenty in them was not sure if large or xtra large or if there is a better alternative