Bike bags make commuting and bike trekking effortless - getting rid of that heavy backpack and moving the stuff to panniers is a great increase in comfort, and your jersey or jacket can more efficiently get rid of the moisture and heat on your back.
Handle bar bags are practical and in some cases the only bag you'll need. It can take your phone and a spare tire plus a miniature pump, keys and a windbreaker. Most handle bar bags can be equipped with a waterproof map case for touring purposes.
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