I'm going to buy one of these very soon, and I was going to get the HDD version (the big space is handy for me). However, I'm concerned about how easily they could be damaged from knocking it about as I carry it around with me. Are they plasticy flimsy things or will they withstand being thrown about a bit in a backpack or handbag? Is it worth getting the SSD version, just to be on the safe side? (Also, how much heavier would the HDD version be compared to the SSD one?)