Well, if I understand you correctly, I think so. The bag in the freezer never worked well for me, cools too fast and the vapor condenses. My bag vape also has a GOG water pipe attachment, and I always filter my bags through a water pipe as hot air vapes are very harsh to me, being used to BHO. I find, with either bho or hot air vapes, that too much cooling is a bad thing. The temps are already lower than smoke, and condensation of the vapor becomes a big problem. Because of this, for vaping, either BHO or bag/whip, I use a single chamber no perc bong. Straight one hole downstem. Adding percolation cools too much and leaves me getting less high and with less thick hits. I havent rigged a bag or whip up to a gravity bong - they generate so little vapor at such a slow rate it seems like one would be unable to get a nice milky gravity bong hit. I have rigged up an oil concentrate bowl to a large 2 liter distillation funnel, which is a large enclosed funnel with a GOG fitting for a top opening and a valve on the bottom. I filled it with water, loaded the bowl with ~.5g high THC budder, and started releasing the valve while working the bowl with the heated wand. The vapor turned the thickest white I've ever seen, it was incredibly smooth, seemed Id exhale vapor forever, 5+ exhales and I was still emitting visible vapor. I started hallucinating within 5 minutes - jungle calls surrounded me, everything went red green and yellow, the walls shapesifted, this occurred to myself and my friend who took a similar dose. Worst trip ever - like low dose of mescaline but with anxiety instead of euphoria. The thing that folks dont realize is that highly pure (or pure) THC isnt fun - it desperately needs the CBD et al to kill the weird hallucinations and suppress the uncomfortable body high the THC causes. The BHO was made from dry ice hash from wonder woman, a type of extraction that favors delta 9 from strain that is notably high in delta 9, which is why it yielded the fluffy white powdery budder - I tend to stick to whole herb extractions of high CBD strains now, as the earwax to shatter oils are much more medicinal. But yeah... sorry for the ramble, a bit stoned. I dont think a gravity bong is necessary for a bag - if you add a perc, I think youll find you actually get a lot less vapor per hit as it condenses it, and without it, youre just kinda moving the vapor from one large chamber (the bag) to another (the gbong). If you are vaping at high temps, try scaling the temp down (should be ~380, 450-500F and it starts burning) and setting the fan on the lowest setting, in order to get milkier hits without scorching. But youll never get vapor as milky as bong smoke from a hot air vape, not without burning. The only way to get vapor that milky is with BHO and a concentrate bowl/wand.