WATERFLY Small Lightweight Packable Backpack: 20l Hiking Daypack Man Woman
- Hiking Daypack
- 0.7 cu ft
- back
- Shoulder Strap
- More reviewed than 62%
A foldable, lightweight 20 liter daypack that reviewers use as a packable second bag for travel days and short hikes.
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How it ranks among the 21 hiking daypacks we track
4.5★ across 3,800 Amazon ratings, Bayesian-smoothed toward the category average.
3,800 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
900+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 21 hiking daypacks we track - how the scorecard works · full hiking daypacks data report. Confidence: high - strong rating volume and complete data.Updated 6 days ago. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
This WATERFLY daypack folds down to about 8.7 by 6.3 inches and weighs just 10.2 ounces, made from recycled nylon so a 20 liter bag can ride inside a suitcase until it is needed. It is aimed at day trips, hiking, and travel where a second bag needs to disappear when not in use.
The pitch here is genuinely about the fold, not just the capacity: reviewers bought this specifically to stash inside a carry-on for use as a park or day-trip bag once they landed. Several compare it directly to other 20 liter packs and land on the multi-compartment layout as the reason it beat the alternatives.
- 20 liter capacity that folds to 8.7 x 6.3 inches
- 10.2 ounce recycled nylon construction
- Multiple compartments including a removable zip pocket
- Machine washable after heavy use
Who it's for
Travelers and day hikers who want a compressible second bag for park days, short hikes, or as a spare carry-on item. Less suited to anyone needing padded straps for regularly heavy loads.
What buyers say
From Amazon customer reviews.
Reviewers who used this as a travel daypack praised how well the multiple pockets kept things sorted, from Disney park days to weeks of travel through South America, and several said the fold-down size and light weight impressed them more than expected for the price. The recurring gripe was construction detail, not the material: one long-term traveler wanted the front bottom pocket built with two zippers instead of one for faster access, and another noted the small pockets are sized modestly, fitting little more than a phone or a pack of cigarettes.
Strengths and trade-offs
Drawn from this product's published specifications.
- Folds down to about 8.7 by 6.3 inches for easy storage
- Only 10.2 ounces, does not add noticeable back heat
- Multiple compartments reviewers rate above competing 20L packs
- Held up through a full wash cycle after heavy use
- Straps are not padded, though width helps offset this
- One reviewer wants two zippers on the front bottom pocket instead of one
- Not built for consistently heavy loads
Specifications
| Brand | WATERFLY |
|---|---|
| Model | ONJ01 |
| Dimensions & fit | |
| Item Weight | 10.2 ounces |
| Item Dimensions D x W x H | 6 × 10.8 × 17 inches |
| Apparel Fabric Weight Class | Lightweight |
| Compatible Device Size Maximum | 16.9 inches |
| Fit to Size Sentiment | Adults of various sizes |
| Capacity & performance | |
| Storage Volume | 0.7 cu ft |
| Age Range Description | Children |
| Construction & materials | |
| Material Type | Nylon |
| Shell Type | Soft Shell |
| Outer Material | Nylon |
| Color | A-teal Blue |
| Apparel Fabric Stretch | No Stretch |
| Included components | |
| Unit Count | 1 |
| Backpack Design | Daypack Backpack |
| Other details | |
| Fit Type | back |
| Strap Type | Shoulder Strap |
| Apparel Closure Type | Zipper |
| Sport Type | Hiking |
| School Type | High School |
| Number of Compartments | 4 |
| Number of Items | 1 |
| Number Of Pockets | 4 |
| Lining Description | Nylon |
| Embellishment Feature | Cord |
| Other Special Features of the Product | Foldable, Lightweight |
| Product Style | Daypack Backpacks |
| Recommended Uses For Product | Travel |
| Import Designation | Imported |
| Water Resistance Level | Water Resistant |
| Pattern | Solid |
| Style Number | ONJ01-08-US |
Other WATERFLY hiking daypacks
How it compares
This product against the closest alternatives we track in hiking daypacks.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| WATERFLY Small Lightweight Packable Backpack: 20l Hiking Daypack Man WomanThis product | 4.5 / 5 | 3,800 | 4.4 / 5 |
| ZOMAKE Lightweight Packable BackpackZOMAKE | 4.6 / 5 | 20,000 | 4.6 / 5 |
| EVANCARY Crossbody Bags Small Sling Bag for Men Women Travel Hiking Mini Sling Backpack…EVANCARY | 4.4 / 5 | 7,900 | 4.5 / 5 |
| Pritent Crossbody Bags for Women Men Trendy Sling Bag Backpack Casual Chest Bag with…Pritent | 4.5 / 5 | 6,200 | 4.5 / 5 |
| Osprey Nebula Commuter BackpackOsprey | 4.6 / 5 | 859 | 4.4 / 5 |
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Questions about the WATERFLY ONJ01
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How small does the WATERFLY backpack fold down?
It folds to about 8.7 by 6.3 inches, small enough to pack inside a carry-on or suitcase.
Is this backpack machine washable?
Reviewers report washing it after heavy use, including one who ran it through a washing machine after a spill, with the bag coming out looking new.
Are the shoulder straps padded?
No, the straps are not padded, though reviewers say the width still keeps it comfortable for day-trip loads.