Hi,
see links above, MI9H6GWsYYE is the youtube video id, LAPG-BG-1119Jumbo is the bag

I used to carry a Maglight there. But now you can buy LED flashlights the size of your thumb that absolutely blow away a D-cell Maglight. So after those came about, I started carrying an ultra-small fold up umbrella in that pocket. I never use umbrellas, so after a bit I said to myself, "...so why am I carrying one?" Currently I have some first aid supplies in there. You get the correct sized Tylenol bottle and mix whatever pills you want in there (I know, they say never to do that, but I don't listen). I've got some 4x4's and stretch wrap in there. And bandaids. Polysporin opintment. Miscellaneous first aid stuff.

I like some of these bags and seem to have the same issue with pockets. They are either too big or two small. Too big is preferable, all you need is smaller bags to separate items. Too small is a non-starter.

Regarding umbrellas, think instant shelter. I don't carry one either here in SOCAL, but the one I currently own was purchased during a major thunderstorm when I lived in VA a long time back. It wasn't cheap, but is really well made. A small well made collapsible umbrella should be a consideration for areas where rain is often in the forecast.