I've used Velvia in those Quickload envelopes with the 545 holder. They're great. Holds a lot of film in a compact space and light weight. No need to load them so they're dust-free. They're kinda expensive though :-(
I've been everywhere ooooohhh yeaahhhh still I'm standing tall.
Maybe I won't put mine in the bin just yet then!
"He took to writing poetry and visiting the elves: and though many shook their heads and touched their foreheads and said 'Poor old Baggins!' and though few believed any of his tales, he remained very happy till the end of his days, and those were extraordinarily long "- JRR Tolkien, ' The Hobbit '.