Phosphorescent Bag Lining

Phosphors exist in different types. All absorb energy when available, and release energy later. The main difference is how quickly they release the absorbed energy.

For a purse/handbag, which is usually closed and therefore doesn't allow energy (like sunlight) to enter, we might need a trick like glowing tritium, to produce energy (fairly steadily for years, and chemically tritium is hydrogen that could be part of a hydrocarbon plastic liner) that the bag lining could absorb. Or we might have a UV light and a battery-- the owner presses a button before opening the bag, which illuminates the bag lining so it can absorb energy. The lining then releases energy so the user can more-easily see the contents of the opened bag.

The obvious alternative to this Idea is a bag with a built-in flashlight, that is turned on automatically when the bag is opened. But that is too easy for the HalfBakery! (Except a couple links below indicate that that didn't prevent folks from posting that idea, anyway.)