Sold to Dave: a new Outdoor Research Hydroseal Dry Sack #5. 6.4oz, 37 liter volume, measures 27" long x 17" across the top when flat and about 18"x12" as shown with the top rolled 3 times to seal. Perfect for a pack liner, packraft accessory, etc. I bought it to use for bikepacking and ended up with a waterproof backpack instead, so this one can go. Opened for inspection only and unused. $20 including US shipping and PayPal fees.

Specifications:
#5 Avg. weight: 5.4 oz [6.4oz on my scale]
Dimensions: 27 1/4in. x 11in./69 cm x 28 cm Volume: 2259 cu. in./37.0 L

Features:
Hydroseal coated Antron nylon is waterproof and durable
Waterproof taped seams
Roll-top waterproof closure
Durable buckle secures roll top
D-ring next to buckle
External daisy chain
Webbing bottom handle