Ball retrievers are telescoping poles with a device at the end that scoops up and traps golf balls, and are used for reclaiming a ball from a water hazard. These are allowed under strict rules (provided of course the proper one-stroke penalty is assessed for hitting the ball into the water in the first place), but for courtesy to other players a player retrieving his ball should do so quickly, and should not spend time retrieving abandoned balls.
Travel bags are available with many combinations of size and features, but are distinguished by rigid and/or heavily padded construction, including the clubhead cover (which on most other bags is simply an unpadded "rain fly"), and locks on the zippers and bag cover. These features protect the clubs from abuse and theft, and generally makes the bag suitable for checked airline luggage. Travel bags are generally used by amateur players that travel occasionally, such as business executives; rigid flight cases that enclose the actual golf bag are generally preferred by touring players, as these cases can enclose any golf bag, are more discreet as to their contents thus further deterring theft, and the case's weight and bulk can be left behind while on the course where it's not needed.
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