RedLocks:
If the temperature begins to rise in your bag either from the weather, body heat or maybe a bike motor, the aroma becomes more apparent if not airtight. Call myth busters?
That'd be a fun episode!

bikeTripper:
Use Tupperware, a jar or some similar airtight container inside of the backpack.
That's a good idea. After I made the post it occurred to me that there's a freshly empty Metamucil bottle laying around, which is kinda funny if you think about it. "Oh look, I'm just constipated."
Oh My High Reviewed by Oh My High on . Do waterproof backpacks hide weed? I ride a scooter and am looking for more secure ways to transport weed home back from a pickup. I have an underseat compartment where I store my vehicle registration, and while the compartment itself is airtight, it would be risky to open it up while a cop was standing nearby. So I'm thinking of a backpack, since luggage is constitutionally protected from warrantless searches. I have an Overboard 100% waterproof backpack (with a "high frequency welded construction") and so I'm guessing it Rating: 5