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The accordion sides actually collapse flat when empty, which freed up a ton of shelf space in my darkroom. Also, the heat-conductive plastic keeps the developer stable even when my basement gets chilly—that opaque body is a nice bonus for blocking light.

Finally a bottle that keeps my developer at the right temp without me babysitting it on the counter—the heat-conductive walls actually hold the TCS-1000's setting nicely. The accordion design squeezes down flat when I'm done, which frees up half my darkroom shelf.

The accordion pleats actually collapse down flat as I drain the last of the developer, so there's barely any air left to oxidize the chemistry. The opaque plastic blocks light completely, and the heat-conductive body holds my working solution right at 68°F for the whole session without fiddling with