I use Rinkya as my primary deputy.  I'm feeling 
pretty loyal to them, until they give me a reason 
to be otherwise.  For all the reasons given by 
other people.

Physically speaking, their free bags are 
fantastic.  Strong, clear, easy to use, no need 
to snip corners to let the cel breathe.  
Everything good.

What we don't know is the chemistry of the bags;  
are they acid-free, or are they highly acidic?  
Nobody qualified has ever weighed in with an 
opinion.

As for me, I use them, even with expensive cels.  
My cels will probably outlive me, even in acidic 
bags, so I prefer to worry about things with a 
much higher risk and worry factor.