Here's a handful of chambers you all may find interesting from a discussion about reducing load size in the Wunderlampe. My friend uses an
Aromed Recreation chamber with his tumbler bong and does small screen loads, but is looking for a way to go smaller. I just got a second
Starlight MyVapeLAB chamber.
The Starlight has a couple great features: it dispenses with the chamber-spanning flat screen and instead holds the herbs in a basket screen or S&B capsule on 3 pinches in the glass neck. This allows you to use a smaller load with the heat focusing more efficiently as you pull. It works great, partly because the chamber is a bit shorter than standard and places the heater closer to the screen. The new Starlight is shorter still.
Here's a comparison of the relative depths of the chambers I have. L-R, new Starlight, old Starlight, Aromed Short, and the WL's OG chamber.
So, the new Starlight, left, has a length almost exactly the same as the heater itself. The others in comparison vary in the amount of room you can have under the heater. Both the Starlights are very close to the heater.
You can also see, however, that the Short chamber is in fact significantly shorter than the OG chamber, right, by nearly a centimeter where the screens rests. To me in use it feels significantly closer to the heater than the OG does. That was one reason I tried the basket in the neck (which worked ok, but not quite as good as the starlight). The Recreation chamber is between the Short chamber and the Starlight in length, but has the OG-style downstem with a 14mm male joint part-way down the downstem replacing the silicon gasket.
Anyhow, you may decide you do like the closer heating with the Recreation chamber, or you may find the slightly larger distance with the Short chamber is sufficient. More flexibility comes with the various lengths of the necks. If you have a bong you'd like to use that has a vertical joint, there's a jointed chamber for you.
One caution about the Starlight chambers: they may be made to order, it's not clear. It may take some time for yours to arrive--it did mine. I think it's worth it, it's my main chamber nowadays.