I'm sending a magazine to Scotland and I don't want to be damaged. On the corner of the envelope I've written 'Please do not bend,' but in Gàidhlig, would that be 'Na cam e' or 'Na crom e, mas e bhur toil e' ? or is that not the way to say it?
In Irish I'm assuming it would be 'Ná lúb é, le do thoil'

The word lùb also works in Gaelic, so:
Na lùb e, mas e ur toil e
seems ok, although I've never actually seen it (note that it's ur, not bhur)

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I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.

Go raibh maith agat

A second question, if I may - How would you say 'Printed Matter' (Ábhar Clóite) ?

Would it be 'Adhbar Liosairte' ?

"Adhbhar clò-bhuailte" ?

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Don't bother with the "mas e do thoil e" -- it's hardly ever used anyway.

I'm not sure if "adhbhar" is really used for physical matter much these days -- it's not something I've consciously encountered.

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A language belongs to its native speakers, and when you speak it, you are a guest in their homes.
If you are not a good guest, you have no right to complain about receiving poor hospitality.