The "air" valve use is quite confusing. One spot it's to adjust the air in the bag. Here in the questions, it's a water drain valve. Which is it?

It adds air as insulation within sheel of bag to keep the contents colder longer. Not a drain as bag is waterproof

Trying to decide between 20L and 30L, what are the dimensions of each?

Hello there, Thank you for reaching out to us! As with your inquiry, the dimensions of each Wise Owl Outfitters Backpack Cooler are as follows: Wise Owl Outfitters Backpack Cooler 20L Package Dimension: 15.08 x 9.21 x 4.76 inches Wise Owl Outfitters Backpack Cooler 30L Package Dimension: ‎18.4 x 7.4 x 7.4 inches Hope the above helps! Always feel welcome to reach back to us at hello@wiseowloutfitters.com if you need assistance. Take care! All the best, Wise Owl Outfitters Support Team

How many cans can each size hold?

I bought the 20L. It holds a 12 pack with ice nicely. You could fit a few more but if you want it to be water and airtight, you need to have at least 3 folds before clipping. At first, I put all my drinks in first and ice on top. A better use is to put in some ice first and then layer drinks and ice...much easier to get them, especially if you have different flavors of drinks. Excellent product. I'm gonna buy the 30L, too.

What is the diameter on the inside of the bag?

Diameter is measured across the top of a cylinder, like how wide is the circular opening at the top. I believe you gave the height from top to bottom.

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Backpack Cooler – Insulated, Leakproof & Waterproof Soft Cooler Bag, up to 24-Can Capacity – Portable Ice Chest for Camping, Beach, Travel, Hiking, Kayak & Picnic

Product ID: 317240077

Details

Brand
Wise Owl
Color
Blue
Material
PEVA nylon
Package Information
Bag
Capacity
30 Liters
Product Dimensions
11.5"D x x

🎒Ergonomic adjustable straps for comfort

💧100% leakproof & waterproof design

❄️Keeps contents ice cold all day

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VT17364

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Stay Cool, Carry Smart – The Ultimate Chill Companion

GENEROUS 24 CAN CAPACITY - Spacious 30L interior fits up to 24 cans plus ice, ideal for group outings or solo indulgence.
ARCTIC CHILL ALL DAY LONG - Multi-layered insulation locks in cold for up to 12+ hours, so your drinks never lose their edge.
TAILORED COMFORT ON THE MOVE - Adjustable air valve and padded straps ensure a perfect fit, making every adventure effortless and stylish.
VERSATILE ADVENTURE ESSENTIAL - From beach days to backcountry hikes, this backpack cooler is the must-have companion for every millennial explorer.
LEAKPROOF WEATHERPROOF ARMOR - Crafted with heavyweight PEVA nylon and a 1” thermal shield, this cooler stands up to spills, rain, and even submersion.

The Wise Owl Outfitters Backpack Cooler is a 30L insulated, leakproof, and waterproof soft cooler bag designed to keep up to 24 cans ice cold for over 12 hours. Made with durable PEVA nylon and a thick thermal shield, it features adjustable straps and an air valve for personalized comfort and insulation. Perfectly sized and rugged enough for camping, hiking, beach trips, and picnics, it’s the go-to portable ice chest for active professionals who demand style and performance on the go.

Specifications

Brand	Wise Owl Outfitters
Color	Blue
Material	PEVA nylon
Package Information	Bag
Capacity	30 Liters
Product Dimensions	11.5"D x 11.5"W x 16"H
Special Feature	Insulated
Recommended Uses For Product	Camping, Fishing, Hiking, Picnic
Model Name	Icemule Cooler Classic Large (20L)
Product Care Instructions	Hand Wash Only
Insulation Material	nylon,peva
UPC	652671418341
Size	30L
Manufacturer	Wise Owl Outfitters
Item Package Dimensions L x W x H	19 x 8.75 x 5 inches
Package Weight	0.93 Kilograms
Item Dimensions LxWxH	11.5 x 11.5 x 16 inches
Brand Name	Wise Owl Outfitters
Part Number	COBMB30L

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