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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Wise Owl Outfitters 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
Capacity
30 liters
Color
Blue
Material
PEVA nylon
Model Name
Icemule Cooler
Package Information
Bag

🎒Ergonomic adjustable straps for comfort

💧100% leakproof & waterproof design

❄️Keeps contents ice cold all day

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

ASIN	B08PZG42PP
Additional Features	Insulated
Best Sellers Rank	#439,826 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1,150 in Camping Coolers
Brand Name	Wise Owl Outfitters
Capacity	30 liters
Chamber Depth	16 inches
Color	Blue
Container Type	Bag
Customer Reviews	4.4 4.4 out of 5 stars (1,171)
Insulation Material Type	nylon,peva
Item Dimensions D x W x H	11.5"D x 11.5"W x 16"H
Manufacturer	Wise Owl Outfitters
Manufacturer Part Number	COBMB30L
Material Type	PEVA nylon
Model Name	Icemule Cooler Classic Large (20L)
Model Number	COBMB30L
Number of Items	1
Pattern	Adventure/Outdoor Themed
Product Care Instructions	Hand Wash Only
Recommended Uses For Product	Camping, Fishing, Hiking, Picnic
Size	30L
UPC	652671418341
Water Resistance Level	Waterproof

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