Waterproof cover for backpack

Can anyone recommend a waterproof cover for a backpack? I currently have the Flipside 300 but it does not have a built in rain cover.

I have the same pack, Lowepro Flipside 300. I carry a few large black plastic bags with me. First one tied up top & then another over the top tied at the bottom. I can run my fingers under the top strap/handle to carry to the car/house.

Check most camping stores. REI's brand is the Duck's Back for instance. They're sized on the pack's capacity in litres.

Matin make a range of covers

http://shop.ebay.com …rksid=p3286.c0.​m270.l1313

Thanks you for the info Jon and lnnes.....I'll be getting one of those Matin....good to have around when needed.

^ Thank you as well for the links. Never knew they made such a thing. I can toss those bags now !

Does anyone know what size to get for this pack: Lowepro Flipside 300?
- Seems the Medium will work, but want to confirm.

Thanks !

The outside of the Flipside 300 is about 20L. The medium is for bags up to 25L.....so I think medium will do the trick (small only goes up to 15L)

DL Photo wrote in post #12100576
The outside of the Flipside 300 is about 20L. The medium is for bags up to 25L.....so I think medium will do the trick (small only goes up to 15L)

Thanks for the info.

I guess I'll be purchasing this one then:

REI Duck's Back Rain Cover - 20 Liters
http://www.rei.com/pro​duct/778474

* Will update on the fit.