Here's what other sites are saying:
The Dry Bag PS490 is made out of Ortlieb's strongest heavy-duty fabrics to stay strong on any adventure whether it be watery or rocky. It can keep your gear dry when splashed on a paddling trip, and the fabric's tear-resistance should stay strong if the bag tumbles off your bicycle. Ortlieb installed a clever valve inside that deflates the bag as you roll the top shut.
Where to Buy
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Ortlieb Dry Bag PS10
Sea to Summit Ultra-Sil Dry Sacks
$13 - $15
SealLine BlockerLite Compression Dry Sack Dry Bag / Compression Sack
$42 - $44
SealLine Blocker Compression Dry Sack Dry Bag / Compression Sack
$33 - $49
Outdoor Research Graphic Dry Sack
$14 - $20
Sea to Summit eVAC Dry Sack
$18 - $26