Back to the floods in Texas...
It was actually raining enough in Texas that people started carrying umbrellas. So stores started providing these special bags for customers to put their wet umbrellas into.
Nakumatt in Kenya would not provide such a thing. And it would be appropriate there, as rain is more common in Nairobi than in San Antonio - at least during Kenya's rainy seasons.
But there is an alternative, at least in Kenya. Many Chinese umbrellas there come with collapsable plastic cup-like covers - so the wetness is contained.