Has anyone used the plastic tanks with aprons that Freestyle sells? They're about $5 each for 35 mm, and $7 for 120 size; look like they're built like a stainless tank (nesting cap and bottom, with a baffle light trap in the top, and inversion cap), but all plastic. I'm thinking of getting a couple of each with my next film older, just to have as backups. I get visions of loading all my tanks (like I did today) and then wanting to prioritize a roll that's just come out of a camera (like if the aliens land in the side yard). Having one or two of these in each size could save the day... 

