Leashes or loops will work, particularly to fairly sturdy canvas bags or rucksacks, or, if you think it's going to be damp down there, to something less absorbant.
Run the loops or leashes (colour-coded is clever and can be done via tape or cable-tie) to small bungee loops on the locker side. Ideally, you have a bunch of sacks secured by loops descending into the gloom, and a big open space in the middle for PFDs and fenders, etc (light, bulky stuff).
If you put odd-sized or big tools (such as torque wrenches, pipe wrenches, spare yachtsman's anchors, deck scrubbers, etc.) down there, put them in closed-cell foam surrounds or some sort of padding, because they will move around in a bag and dent or chafe the fibreglass.
A final suggestion is a couple of stick-on LED "closet lights" on the underside of the lazarette or locker deck. Tap them on and you can get a dim, but general overall view of what's down there in an area that is usually poorly lit unless it's time for the noon sight.
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