WATERFLY Packable Hiking Daypack 20L
- Storage Volume: 0.7 cu ft
- Item Weight: 0.64 pounds
- Strap Type: Shoulder Strap
- Water Resistance Level: Water Resistant
Last refreshed Sep 9, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
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ASIN: B087R37LZ2Model: ONJ01Category: Hiking Daypacks
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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.
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.
Pros and cons
- Folds down to about 8.7 by 6.3 inches for easy storage
- Only 10.2 ounces, does not add noticeable back heat
- 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 | 0.64 pounds |
| Apparel Fabric Weight Class | Lightweight |
| Fit to Size Sentiment | Adults of various sizes |
| Item Dimensions D x W x H | 6 × 10.8 × 17 inches |
| Compatible Device Size Maximum | 16.9 inches |
| Capacity & performance | |
| Storage Volume | 0.7 cu ft |
| Age Range Description | Children |
| Construction & materials | |
| Outer Material | Nylon |
| Material Type | Nylon |
| Apparel Fabric Stretch | No Stretch |
| Color | A-Teal Blue |
| Shell Type | Soft Shell |
| Included components | |
| Backpack Design | Daypack Backpack |
| Unit Count | 1 |
| Other details | |
| Strap Type | Shoulder Strap |
| Water Resistance Level | Water Resistant |
| Fit Type | back |
| Number of Compartments | 4 |
| Number Of Pockets | 4 |
| Apparel Closure Type | Zipper |
| Lining Description | Nylon |
| School Type | High School |
| Sport Type | Hiking |
| Number of Items | 1 |
| Import Designation | Imported |
| Pattern | Solid |
| Product Style | Daypack Backpacks |
| Recommended Uses For Product | Travel |
| Style Number | ONJ01-08-US |
| Embellishment Feature | Cord |
| Other Special Features of the Product | Foldable, Lightweight |
Closest rivals on specs
ZOMAKE Lightweight Packable Travel Daypack- Item Weight 0.64 vs 0.49 pounds (+31%)
AMJ Crossbody Sling Bag Chest Daypack- Item Weight 0.64 vs 0.55 pounds (+16%)
- Storage Volume 0.7 vs 0.6 cu ft (+17%)
G4Free TN0124 Packable Hiking Backpack 20L- Item Weight 0.64 vs 0.38 pounds (+68%)
Frequently asked questions
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.