A box-shaped all-in-one (AIO) device may give a brand more room for graphics; a slim pen may look simpler to pack. Neither guarantees the hardware will run on your filling line or fit the retail presentation you have approved. Compare models against the same oil, fill target, packaging specification and production workflow. Use shape to narrow the list, not to predict performance.
Start with the constraints you cannot change
Record the intended oil and fill volume, maximum finished-pack dimensions, usable label or print area, expected order quantity, and the filling and closure equipment you will use. If artwork is already approved, measure the available print area. If a filler has already been selected, obtain its fixture drawing and capping limits. These inputs should decide the shortlist before appearance does.
Five checks to run on every candidate, box or pen
Checks 1 and 5 can start from drawings and quotations. Check 3 needs a model specification plus sample behavior. Checks 2 and 4 need physical samples on your own equipment.
1. Device and finished-pack footprint
A box body may have a broad face for graphics and a shorter overall length; a pen may have a narrow silhouette. Compare dimensioned drawings for the device, retail pack and shipper, then check how many finished units fit your chosen tray or carton. What matters is the approved pack-out, not bare device width.
2. Reservoir visibility during filling and inspection
An oil window helps only if it exposes the fill level under your line’s lighting and orientation. Seat each candidate in the proposed fixture. Can an operator or camera see the fill boundary and obvious trapped air without rotating the device? Record yes or no for each candidate; do not infer visibility from the outer shape.
3. Controls and information surfaces
Screens, power controls and activation methods are model-specific. A larger face can create room for information or artwork, but it does not establish a particular battery capacity, display function or runtime. List what the user needs to see or control, then confirm the specification and sample behavior of each candidate. If you need a display, compare ILEVA’s box-style disposable vape hardware with pen and other formats; verify each model’s features individually.
4. Filling, closure and fixture fit
Compare fill-port access, mouthpiece or cap closure method, the surfaces your fixture grips, and clearance for the nozzle and capping head. A fixture designed for one body shape may need a new nest or orientation for another. Do not assume either shape is faster to fill. Run a short trial on the intended equipment. Record cycle time, closure defects and leaks after a rest period. Define its time, orientation and temperature once, and apply them to every candidate.
5. Supply route, artwork and documentation
Can you obtain samples of the proposed configuration? Is it currently stocked? Can it be decorated to your artwork at the required quantity and schedule? Answers differ by model and date. Ask which material and test documents are available for each model, and confirm the finished-pack requirements for your target market. Treat tooling, minimum order quantity and lead time as quotation-specific.
What body shape can and cannot tell you
Use form factor as a packaging and handling clue, not a shortcut for specifications. A broader box face may create more uninterrupted artwork area, while a pen silhouette may suit a narrow retail pack. Those are reasons to request drawings—not proof of print method, capacity or cost. Check the usable decoration area after the mouthpiece, oil window, screen, charging port and required labeling have been accounted for.
- Box candidate: check whether its width changes tray count, carton dimensions or the fixture nest. If a display is part of the brief, verify exactly what that particular screen shows and whether the chosen artwork remains legible around it.
- Pen candidate: check overall length, orientation in the pack and how reliably the body can be gripped and indexed on the filling line. A slim exterior does not guarantee a smaller finished pack or easier closure.
- For both: request a dimensioned drawing and the exact mouthpiece, reservoir and charging configuration. Two devices with the same silhouette can require different nozzle clearance, capping force or artwork methods.
If the project already has an approved carton or line fixture, test both shapes against that fixed constraint first. If neither fits, changing the pack or fixture is a separate cost and timing decision; do not bury it in the device unit price.
Run a fair sample comparison before choosing a format
Use the same written trial plan for each shortlisted SKU and revision. Agree the pass criteria before testing so the most attractive design does not receive an easier standard.
- Confirm the sample: log the model, revision, tank configuration, mouthpiece and quoted supply route. A visually similar substitute is not the same test article.
- Keep the inputs constant: use the same intended oil, target fill, operator, equipment settings, storage conditions and inspection method for every candidate. If your program uses oils of different viscosities, repeat the matched test for each representative formulation. Record any fixture or nozzle change required by each device.
- Capture measurable outcomes: record fill accuracy, visible fill boundary, cycle time, closure or rework events, and leakage after the same defined rest period. Note charging and activation behavior only where those features matter to the brief.
- Price the complete route: compare sample and bulk unit prices alongside tooling or fixture changes, decoration, packaging, freight and quoted lead time. Keep unquoted items marked “unverified.”
If one candidate fails a must-have criterion, reject that configuration before comparing cosmetic preferences. If both pass, choose using the documented trade-off between finished-pack footprint, line effort, user-facing features and supply certainty. For a more detailed equipment trial, use our cartridge and AIO filler acceptance-trial checklist.
A comparison sheet for your shortlist
Record the same fields for every candidate:
- Model/SKU and revision
- Device, retail-pack and shipper dimensions, plus usable print area
- Fill boundary visible when seated in the intended fixture
- Required controls and verified behavior
- Fill-port, mouthpiece closure and fixture fit
- Trial cycle time, rework and post-rest leak results
- Available material and test documents
- Sample, stock or custom route; artwork decoration feasibility; quoted MOQ and lead time
- Source of each specification or trial result
Mark unknowns “unverified” rather than leaving them blank. Do not assume a feature listed for a whole category applies to every model in it. Drop any candidate that fails a constraint you cannot change, whatever its shape.
Use samples to resolve what drawings cannot
Request several units per model so a single faulty piece does not decide the result. If results differ, examine reservoir architecture, oil path, closure and fixture fit before attributing the gap to body shape. ILEVA’s broader AIO disposable hardware collection includes pen, box and other formats; use it to build a comparison set, then confirm details on individual product pages.
The decision comes down to which empty device you can fill, inspect, pack and source for your program, with evidence at each step. Shortlist candidates from both shapes, then request samples of the exact configuration before approving a production order.
