Flowston Clear Backpack with TSA Lock 18"
- Storage Volume: 1 cu ft
- Compatible Device Size Maximum: 15.6 inches
- Strap Type: Adjustable, Padded Strap
- Backpack Harness Type: Shoulder Harness
Last refreshed Sep 9, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
Recommended for its size, TSA lock and expanding main compartment, with one reported strap failure worth weighing for heavy daily student use.
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ASIN: B0FVS66XF5Category: Casual Daypacks
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Overview
An 18 inch clear backpack from Flowston built from thickened 0.5mm PVC, with a TSA-approved lock, a 15.6 inch laptop sleeve, and reflective tape on the straps and side pockets for visibility at night.
A TSA lock is what sets this apart from most clear backpacks, which usually skip locking hardware entirely.
- 18 x 13 x 7.5 inch capacity
- TSA-approved lock included
- 0.5mm PVC over an oxford cloth bottom
- Reflective tape on straps and side pockets
Who it's for
Travelers and students who want an extra-large clear backpack that locks and can expand like packing cubes, more than someone who just needs the smallest bag that clears a security check.
Pros and cons
- TSA-approved lock actually included
- Holds a 2 inch binder plus full school supplies
- Reflective tape on straps and mesh pockets for night visibility
- One reviewer's shoulder strap broke after about two weeks of daily 7th grade use
- No dedicated luggage strap for stacking on a rolling bag
Performance notes
The 0.5mm PVC is thicker than typical clear-bag plastic and is paired with an oxford cloth bottom and double cross stitching at the strap anchors, which is what lets the main compartment expand about 5 inches and open fully at the bottom the way a small suitcase would.
Specifications
| Brand | Flowston |
|---|---|
| Dimensions & fit | |
| Compatible Device Size Maximum | 15.6 inches |
| Apparel Fabric Weight Class | Heavyweight |
| Fit to Size Sentiment | positive |
| Item Dimensions D x W x H | 7.5 × 13 × 18 inches |
| Size | Large |
| Capacity & performance | |
| Storage Volume | 1 cu fthigher than 52% of 22 casual daypacks |
| Age Range Description | Adult |
| Construction & materials | |
| Material Type | Polyvinyl Chloride (PVC) |
| Outer Material | Polyvinyl Chloride |
| Shell Type | Soft Shell |
| Apparel Fabric Stretch | No Stretch |
| Color | Black |
| Included components | |
| Backpack Harness Type | Shoulder Harness |
| Backpack Design | Daypack Backpack |
| Unit Count | 1 |
| Other details | |
| Strap Type | Adjustable, Padded Strap |
| Water Resistance Level | Waterproof |
| Number of Compartments | 4 |
| Number Of Pockets | 6 |
| Lining Description | Polyester |
| Import Designation | Imported |
| Apparel Closure Type | Zipper |
| Sport Type | Multi-Sport |
| Fit Type | Adjustable |
| Number of Items | 1 |
| Recommended Uses For Product | Gym, Leisure, Sport, Travel, Work |
| Pattern | Solid |
| Product Style | Tsa-Approved Lock Backpack |
| Product Care Instructions | Wipe With Damp Cloth |
Closest rivals on specs
Champion Manuscript Backpack- Storage Volume 1 vs 0.9 cu ft (+11%)
Frequently asked questions
Does the Flowston backpack include a real TSA lock?
Yes, a dedicated TSA-approved lock is included and secures the main compartment zippers.
Will it fit a 15.6 inch laptop?
Yes, the main compartment has a laptop sleeve sized for up to 15.6 inches.