One of the main disadvantages of the Lowepro Flipside 300 is that it does not include an integrated all weather cover.
The Matin 15L waterproof back pack cover now takes care of the problem, made from nylon taffeta and a waterproof coating, the 15L size fits the Flipside 300 perfectly.
Folded up the cover is small, unobtrusive and can be easily packed away.
Completely covers the Flipside from the front, top, bottom
Full coverage from the side
From the back, easy access to all shoulder straps and waist strap, there are no restrictions to the straps.
The elastic closure makes the cover fit nice and tight, preventing air from ballooning it out. There are also extra tie strings, so you can tie it on if required (riding motorbike etc.)
An advantage of the back opening Flipside 300 is the equipment is still accessible with the back pack cover on the bag. With a front opening bag the cover would need to be taken off.
For a cost of $16.00 this is a no brainer for Flipside 300 or 200 owners.
It also comes in larger sizes for different back packs and can be used with shoulder bags.