The most stable recent device that can run KOReader?

[Ken Maltby]

There are also cargo vests, with plenty of such inside (and outside) pockets.

Here are some expensive examples.

Photography supply sites, might also be a good source for safe carrying of your device.

Luck;
Ken

[JSWolf]

Originally Posted by KrzysztofJot

Except the SD slot, Kobo Glo HD seems to satisfy these criteria. It has almost the same resolution as Aura H2O, but packed on a smaller 6" screen (hence achieving higher dpi). However… this device is not being sold anymore. Why? Has Kobo decided that the slightly lower dpi and slightly decreased mobility are ultimately good tradeoffs for a bigger screen size?

35dpi difference is not noticeable. That's the difference between the H2O's DPI and 300DPI. The larger screen is nice to read with.

[Question Mark]

Originally Posted by Ken Maltby

There are also cargo vests, with plenty of such inside (and outside) pockets.

It's also very easy to sew an inside pocket into a jacket or have a tailor do it for you.

[cramoisi]

Originally Posted by KrzysztofJot

Except the SD slot, Kobo Glo HD seems to satisfy these criteria. It has almost the same resolution as Aura H2O, but packed on a smaller 6" screen (hence achieving higher dpi). However… this device is not being sold anymore. Why? Has Kobo decided that the slightly lower dpi and slightly decreased mobility are ultimately good tradeoffs for a bigger screen size?

there is an sd slot inside the gloHD (and it's an easy open since it's not waterproof) thus it can be upgrade and unbrick, if needed. My gloHD is fine with koreader.