The Ooze Bowser was designed to be the pipe you stop worrying about. Made from platinum-cured silicone around a borosilicate glass center chamber — the silicone does the structural work while the glass keeps your material tasting like material rather than rubber. Remove the glass center piece and connect the two silicone ends and you have the sturdiest travel pipe configuration available: drop it, sit on it, throw it in a bag, it's fine.
The turtle shell bowl design is iconic at this point — a genuine design win that happened to also be highly functional. The glass insert lets you watch your hit milk in the chamber so you can control the size of what you're taking. Platinum-cured silicone is food-grade, heat-resistant to 600°F, and cleans up easily with isopropyl.
At $15 it's the most replaceable quality piece in the market. One of those products that's been copied constantly because the original design is just correct.