How many beers will the 20L hold in it? Also is the strap strong enough to hold this full of beers?

The 20L is about 15 inches. If you did a nice circular stack with the cans you might be able to fit a little more than a 12 pack. Or do a circular stack and fill the middle with ice to keep them cold.😉

What are the dimensions on the 40L?

40L size is Height 16.9 x Bottom Diameter 11.9 inches after top is rolled 4 times.

How many pounds of kibble fits into 20L in these travel dog food bags?

Depending on the dog food brand, a bit less than a 10 pound bag.

Family of 5 going on cruise, spending day on beach. What size would be best to carry everyones things? Do i need to 2?

The biggest is the 40L, I carried a cozy thick coleman sleeping bag (that is all). I think my answer will be: "It depends" in how you define things for 5 people. I hope the fact that that same size bag carried a sleeping bag will help you with an idea of how thick it is. Do a Youtube search by writing "Marchway dry bag" and lots of info may pull to help you deeper. Have a good time.

MARCHWAY Floating Waterproof Dry Bag Backpack 5L/10L/20L/30L/40L, Roll Top Sack Keeps Gear Dry for Kayaking, Rafting, Boating, Swimming, Camping, Hiking, Beach, Fishing

MARCHWAY Floating Waterproof Dry Bag Backpack 5L/10L/20L/30L/40L, Roll Top Sack Keeps Gear Dry for Kayaking, Rafting, Boating, Swimming, Camping, Hiking, Beach, Fishing

Product ID: 55452904

⚓Floatable

🎒Backpack style

💧Waterproof

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R1106

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Description

🌊 Dive into Adventure with Confidence!

VERSATILE SIZES - Available in 5L to 40L, perfect for any adventure or daily use.
FLOAT RETRIEVE - Floats on water, making it easy to track your gear during water sports.
WATERTIGHT WONDER - Roll-top seal keeps your gear dry, even in the wildest conditions.
STYLISH FUNCTIONAL - Diverse colors and compact design ensure you stand out while staying organized.
UNMATCHED DURABILITY - Crafted from ripstop tarpaulin, this bag withstands wear and tear like a champ.

The MARCHWAY Floating Waterproof Dry Bag Backpack is a robust and versatile solution for outdoor enthusiasts. Available in multiple sizes (5L to 40L) and colors, it features a roll-top seal for superior waterproofing, ensuring your gear stays dry during kayaking, rafting, and other water activities. Made from durable ripstop tarpaulin, this bag is designed to withstand harsh conditions while remaining lightweight and easy to carry.

Specifications

Item Package Dimensions L x W x H	17.44 x 13.39 x 1.3 inches
Package Weight	0.79 Kilograms
Item Weight	1.65 Pounds
Brand Name	MARCHWAY
Model Name	Dry Bag
Color	Black
Material	PVC
Suggested Users	unisex
Manufacturer	MARCHWAY
Part Number	WDB40LBLA
Style	Backpack
Size	40L

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