Anil
I really wish we still had those little sling bags with airline logos...those made of some plastic vinyl material with metal zips.
There are modern reproductions of these available on a well known auction/purchase site. Use the search term 'retro' with airline bags and there are many, including from now defunct airlines. Many of the adverts use the word vintage to gain more hits but they are reproductions and nothing wrong with that.
I agree with
goudie about vibration to which I would add 'altitude'. I well remember a sector in a Viscount going round the edge of an African thunderstorm as we could not get above or, it turned out, far enough away!
ps My 'log book' is sketchy in the early days but my first flights in a Viscount were around 1970 (which included the above that year in Air Rhodesia, SAY [as was] to JNB) and the last flight was Dec 86 on LHR~IOM before the introduction of the 146 the following summer.