Have heard various people talk of how some beers don't travel well, mainly talking about cask beers but I can't think of any good reasons why this would be. Especially as the conversation normally refers to a few specific beers suggesting many do travel OK. So my thoughts are travel shakes it up and likely results in it getting a bit warm but not to much or shives would blow out. If it possible that different yeasts cause off flavours due to this, am I missing something or is it just a myth?