For the purpose of carrying stuff (on a two week+ trip), I indend to buy an external HDD to be able to backup stuff onto it.

Haven't spend too much time on this, just picked the best selling one off of Amazon - [My Passport Ultra](http://rads.stackoverflow.com/amzn/click/B00E83X9P8) from Western Digital since it was relatively small. But then I noticed some extenal hard drives go as *[rugged](http://rads.stackoverflow.com/amzn/click/B007XOIVQ6) (packed in rubber cushing and ... things).* So I'm wondering, assuming I won't be tossing the bag around and swinging it across the room, are regular extenal hard drives (in a neopren case, just to be sure) solid enough to be carried around (just regular carrying on "trains, planes and automobiles")?

What are your experiences with them?