Best Adjustable Size Backpack Rain Covers of 2025

John Zimmer Avatar
John Zimmer
Last Updated: 5 Feb 2025

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For those who love to explore the great outdoors, a reliable backpack rain cover is a must-have accessory. The Adjustable Size Backpack Rain Covers are an excellent solution to keep your backpack dry during rainy weather. These covers are designed to fit various sizes of backpacks and are made from waterproof materials that will protect your belongings from getting wet. The adjustable straps and elastic cords ensure a snug fit, preventing the cover from slipping off even in strong winds. These backpack rain covers are a great investment for anyone who enjoys hiking, camping, or travelling in unpredictable weather conditions.

At a Glance: Our Top Picks

High Visibility Waterproof Backpack Cover Cover #TOP 1
High Visibility Waterproof Backpack Cover
ftb score rating icon 9.9
Unigear Waterproof Backpack Cover, 10-90L Cover #TOP 2
Unigear Waterproof Backpack Cover, 10-90L
ftb score rating icon 9.8
CampTeck Water Resistant Rucksack Cover 25L - 40L Cover #TOP 3
CampTeck Water Resistant Rucksack Cover 25L - 40L
ftb score rating icon 9.6

Top 8 Adjustable Size Backpack Rain Covers

#TOP 1

High Visibility Waterproof Backpack Cover

Orange
High Visibility Waterproof Backpack Cover Cover
Waterproof Backpack Cover, Reflective Backpack Cover Waterproof, Rucksack Cover Waterproof with Buckle Strap, High Visibility Rain Waterproof Bag Cover for Outdoor Hiking, Travel, Rainy, M 40L Orange

The humpun Waterproof Cover is an essential accessory for outdoor enthusiasts. Made from high-quality, tear-resistant nylon, this cover provides excellent protection against harsh weather, keeping your backpack dry in rain, snow, or fog. Its large reflective safety design features extensive reflective strips, enhancing your visibility during nighttime adventures. You will appreciate the double secure fit, with adjustable elastic edges and additional buckles to ensure stability, preventing any slips or falls. Plus, it is lightweight and portable, making it a convenient choice for unexpected weather changes while travelling.

What We Like
Super waterproof protection
Reflective for night safety
Secure fit with buckles
Lightweight and portable
Versatile for various activities
#TOP 2

Unigear Waterproof Backpack Cover, 10-90L

X001705B63
Orange
M (21-35L)
Unigear Waterproof Backpack Cover, 10-90L Cover
Unigear Rainproof Backpack Cover, 10-90L Waterproof Dustproof Durable Abrasion Resistant Protective Cover for Camping, Hiking, Travel, Cycling (Orange, M)

The Unigear Rainproof Cover is designed to keep your backpack dry and protected during outdoor activities. Made from durable 70D 210T nylon, it offers impressive waterproofing with up to 5000 mm rain resistance, ensuring your belongings stay safe in wet weather. The double-sided zipper allows for quick application, perfect for sudden downpours. With adjustable cross straps, you can customise the fit to secure the cover in place, giving you peace of mind as you hike, camp, or cycle.

What We Like
Highly waterproof material
Easy to apply quickly
Adjustable for different sizes
Compact storage with carry bag
#TOP 3

CampTeck Water Resistant Rucksack Cover 25L - 40L

U6905
Black
CampTeck Water Resistant Rucksack Cover 25L - 40L Cover
CampTeck U6905 Water Resistant Rucksack Cover 25L - 40L Backpack Rain Cover for Cycling, Running, Traveling, Camping, Outdoor Activities – Black

The CampTeck Rucksack Rain Cover is crafted from high-quality polyester, providing excellent protection against water, dust, snow, and rain. Its fabric meets the EU EN24920 standard grade 4 for water resistance, ensuring your belongings stay dry during outdoor adventures. Thanks to the adjustable elastic edge, this cover fits various backpack sizes and shapes, offering versatility for different needs. Measuring 50x56cm, it is suitable for most backpacks with a capacity of 25L to 40L, making it a practical choice for commuting, travel, and outdoor activities.

What We Like
High-quality polyester material
Excellent water resistance
Adjustable elastic for fit
Large size fits many backpacks
Compact and easy to store
#TOP 4

Waterproof Backpack Rain Cover for Outdoor Activities

XITVVyg
Black
S(30-40L)
Waterproof Backpack Rain Cover for Outdoor Activities Cover
Waterproof Backpack Rain Cover(15-75L),Dustproof Rain Cover for Backpack,Adjustable Rucksack Rain Cover,Backpack Rainproof Protector ,Outdoor Anti-tear Backpack Raincover for Camping,Hiking,Cycling(S)

The XITVVyg Rain Cover is designed to keep your backpack safe from the elements. Its waterproof and dustproof material protects against scratches and dirt, ensuring your belongings remain dry during rainy adventures. With adjustable buckles, you can easily secure the cover to your bag, preventing it from slipping off. The compact storage bag allows you to fold and stow the cover conveniently in your backpack's side pocket, making it easy to carry. This versatile cover is suitable for various bags and outdoor gear, enhancing your travel experience.

What We Like
Durable and wear-resistant material
Adjustable fit for secure coverage
Compact and easy to store
Multi-purpose for various uses

AidShunn 45L Waterproof Backpack Cover

CQ04230202BB1-AD
Black
AidShunn 45L Waterproof Backpack Cover Cover
AidShunn Waterproof Backpack Rain Cover (45L) Foldable Rucksack Covers Rainproof Dustproof Bag Protector for Hiking Camping Traveling Cycling Outdoor Activities Rainy Days

The AidShunn Backpack Rain Cover is designed for ultimate protection against the elements. Its super waterproof fabric, featuring heavy-duty 190T nylon and a waterproof silver coating, shields your backpack from scratches, dirt, and sand. The adjustable elastic ensures a snug fit on various backpack sizes, providing convenience and peace of mind during your outdoor adventures. Lightweight and foldable, this cover can be easily stored and accessed for unexpected rain showers, making it an essential companion for hiking, camping, and other outdoor activities.

What We Like
Super waterproof materials
Adjustable for different backpacks
Lightweight and easy to store
Versatile for various uses
Ideal for outdoor activities
#TOP 6

Pubiao Ultralight Waterproof Rucksack Cover

CQ04230202FY3-PB
Black
Pubiao Ultralight Waterproof Rucksack Cover Cover
Pubiao Waterproof Cover Rucksack Rain Covers Backpack Raincover Ultralight Large Luggage Bag Cover Foldable Protector for Hiking, Camping, Cycling, Outdoor, Traveling (70L)

The Pubiao Rain Cover offers excellent protection for your rucksack during outdoor adventures. Its double-layer design features a wear-resistant 190T Polyester exterior to shield your backpack from scratches and dirt, while the waterproof coating keeps it dry in heavy rain. You’ll find it easy to use, as the adjustable elastic edge ensures a snug fit on various backpack sizes. Additionally, its compact folding size makes it convenient to store, so you can be prepared for unexpected rain without taking up much space.

What We Like
Waterproof up to 3000mm
Easy to put on and take off
Compact and foldable design
Multifunctional use

Naturehike Waterproof Backpack Rain Cover

L: 55-75L
Naturehike Waterproof Backpack Rain Cover Cover
Naturehike Backpack Rain Cover 35-75L Waterproof Rucksack Cover in Nylon Dustproof for Outdoor Cycling Hiking Travelling

The Naturehike Rain Cover is designed to keep your backpack safe from the elements. Available in sizes that fit 35-75L backpacks, it boasts a waterproof index of 2000mm, ensuring your belongings stay dry during rainy outings. Made from high-quality polyester, it is durable and resistant to wear and tear, protecting against scratches and damage. The adjustable buckle strap allows you to secure the cover tightly, preventing it from blowing away in windy conditions. Plus, it folds easily for compact storage, making it convenient to carry along on all your adventures.

What We Like
Waterproof for rainy conditions
Durable and scratch-resistant fabric
Adjustable for secure fit
Compact for easy storage
Ideal for various outdoor activities
#TOP 8

DOINEUFL Waterproof Backpack Cover for Outdoor Use

DOINEUFL
Black
DOINEUFL Waterproof Backpack Cover for Outdoor Use Cover
DOINEUFL 2 Pack Waterproof Backpack Cover, Waterproof Rucksack Cover, Waterproof Bag Cover, Dustproof and Adjustable Rucksack Rain Cover, Outdoor Anti-tear Backpack Raincover for Camping,Hiking

The DOINEUFL Rain Cover is an essential accessory for anyone who enjoys outdoor activities. Made from durable 190T nylon, it effectively protects your backpack from scratches, dirt, and rain, ensuring your belongings stay dry with its impressive 3000mm waterproof rating. The adjustable buckle design allows you to customise the fit, preventing the cover from slipping off during your adventures. Additionally, the reflective strip enhances visibility in low-light conditions, adding an extra layer of safety when you're out in the dark or during rainy weather.

What We Like
Highly waterproof and durable
Adjustable and secure fit
Lightweight and easy to store
Reflective for safety in dark
Buying Guide Image
Editor's Notes

During our adjustable size backpack rain cover research, we found 145 adjustable size backpack rain cover products and shortlisted 8 quality products. We collected and analyzed 26,262 customer reviews through our big data system to write the adjustable size backpack rain covers list. We found that most customers choose adjustable size backpack rain covers with an average price of £7.44.

The adjustable size backpack rain covers are available for purchase. We have researched hundreds of brands and picked the top brands of adjustable size backpack rain covers, including humpun, Unigear, CampTeck, XITVVyg, AidShunn. The seller of top 1 product has received honest feedback from 244 consumers with an average rating of 4.6.

Written by
John Zimmer Avatar

John Zimmer is a truly professional writer on findthisbest.com. He has specialized in writing content a wide variety of fields for over a decade. Since 2011, he has been using his expertise and extensive experience to write content for online shopping guide websites. In addition to writing for findthisbest.com, he has appeared in publications such as The Spruce, Wirecutter and Bestbuy.