I have been using old cigar boxes for years to keep spare change, a tape measure, some paper clips and such behind my drivers seat. Cigar boxes start to deteriorate quickly and are smallish in size and spilled water ruins them instantly.
I saw these molded boxes while in Sears for flashlights and stopped to inspect them closer. I took some measurements of the boxes, and then some behind my seat, and then ended up buying two of the boxes.
First the boxes are almost the width behind each seat so if you use two you still have an area behind your fold down armrest for taller items, nailbelts, umbrellas and the like. In addition these boxes are well constructed and have a flat top when closed so additional things (groceries, etc.) may be stacked on top without worry.
I decided to have a box behind the passenger seat for tools to change tires, lamps, tighten screwheads and other maintenance items. This box is strictly for tools. I inserted the box so that the release latches face rearward so the box can open and be accessible without having to remove the box or not as you require.
The second box fits behind the drivers seat. I spend much time downtown where I never seem to have in my pockets change for parking meters. One payday at the bank I got a couple rolls of nickels, dimes, and quarters to start and daily leave coins in this box instead of trying to put them in and out of my pockets today and tomorrow. I have fit a small medical kit, my 16 ft. tapemeasure, pencils and pens, a small notebook, small binoculars, and many items that are needed from time to time and now they all are together in one spot, in a dustproof and waterproof protector. I faced the release latches to the rear in this box also and now when I get out at a parking meter I simply lean the seat forward, open the latches and extract what coins I need.
Someone pulled right out in front of me driving the other day ( a unique occurance) and later I realized how those boxes had many, many items contained and secure so they did not go flying about.
This small part of life has become very pleasing and organized with quick access due to these quality boxes. I highly recommend them.