September 8, 2026

Open Pod vs Closed Pod Systems

The difference between open and closed pod systems comes down to how you get e-liquid into the pod. Open pods are refillable with any bottled e-liquid you choose. Closed pods come prefilled from the manufacturer and are replaced when empty. This guide explains which suits you better.

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Quick answer: An open pod system (also called a refillable pod kit) uses an empty pod with a silicone-sealed fill port that you top up with bottled e-liquid. A closed pod system (also called a prefilled pod kit) uses factory-sealed pods already filled with e-liquid. You click in the pod and vape, then replace the pod when it runs out. Open systems offer more flavour choice and lower running costs. Closed systems offer maximum simplicity. Most vapers who want long-term value choose open systems.

The Core Difference

Both open and closed pod systems use the same basic format: a rechargeable battery with a clip-in pod containing the coil and e-liquid. The distinction is in whether you can access the inside of the pod to refill it yourself.

An open pod has a fill port, usually a silicone bung on the side or base, that you peel back or slide open to squeeze e-liquid in from a 10ml bottle. The pod can be refilled multiple times before the coil inside degrades. When the flavour drops off or the coil burns out, you replace the pod (or just the coil head in more advanced systems).

A closed pod is factory-sealed with no fill port. The e-liquid is already inside when you buy it and cannot be topped up. When the pod is empty you discard it and click in a fresh one. The pod flavour, nicotine strength and PG:VG ratio are all fixed by the manufacturer.

Factor	Open Pod (Refillable)	Closed Pod (Prefilled)
E-liquid choice	Any 50:50 nic salt or freebase from any brand including Celtic Vapours	Only flavours sold for your specific pod system by the manufacturer
Nicotine strength options	Any strength available in bottled format: 0mg to 20mg	Limited to the strengths the pod manufacturer produces for your device
Running cost	Lower. A 10ml bottle fills the 2ml pod approximately five times. Celtic Vapours nic salts from around £3 to £4 per 10ml	Higher per ml. Prefilled pods typically cost £4 to £8 each for 2ml
Setup effort	Fill the pod yourself. Takes around 60 seconds. Carry a bottle	Click in a pod and vape. No filling. Carry spare pods
Leak risk	Low with modern silicone fill ports. Slightly higher than closed pods	Very low. Factory-sealed pods rarely leak
Maintenance	Replace pod or coil when flavour drops. Clean pod occasionally	No maintenance. Replace the pod when empty
Coil lifespan	Typically one to three weeks depending on usage and e-liquid sweetness	Pod lifetime is the coil lifetime. Typically equivalent to one to three weeks
Environmental impact	Less plastic waste. Fewer pods discarded over the same vaping period	More pods replaced per week than a refillable system

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Refillable open pod kits paired with Welsh-made Celtic Vapours nic salts for the lowest running cost and the widest flavour choice.

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Which Should You Choose?

The right choice depends on what matters most to you: simplicity and convenience or flavour freedom and lower cost. Neither system is objectively better for every vaper.

Choose an Open Pod System If...

You want to use any e-liquid flavour you like, including Celtic Vapours nic salts. You want to reduce running costs compared to prefilled pods. You plan to vape regularly and want the ability to change flavour without buying a whole new pod. You are comfortable with a 60-second filling process once or twice a day. Most regular vapers who have been vaping for more than a few weeks settle on open systems for these reasons.

Choose a Closed Pod System If...

You want the absolute simplest experience with no filling at all. You are switching from a disposable vape and want the closest equivalent experience. You prefer to carry spare pods rather than a bottle of e-liquid. You do not mind being limited to the flavours the pod manufacturer provides. Many new vapers start with closed pod systems and move to open systems after a few weeks once they feel comfortable with vaping in general.

A Note on Running Costs

The cost difference between open and closed systems becomes clear over time. A 2ml prefilled pod typically costs between £4 and £8. At 20mg nic salt that pod contains the equivalent of roughly 400 to 600 puffs for a moderate vaper. The same vaping volume from a 10ml open-system bottle at around £3 to £4 costs significantly less per puff.

With the UK Vaping Products Duty coming into effect in October 2026 the cost of ready-to-use prefilled pods is expected to increase further. Bottled e-liquid used in open pod systems is subject to the same duty. Because you use more liquid per pod the cost impact per puff remains lower in an open system than in a closed one.

If you have chosen a refillable open pod system and want to know how to fill it correctly, read our guide to How to Fill a Refillable Pod. For a more detailed comparison of refillable pods with prefilled options, the Pod Vape Kit Guide covers setup, coil care and e-liquid choice across all pod kit types.

Frequently Asked Questions

Can I refill a closed prefilled pod? No. Closed pods are factory-sealed with no fill port and are not designed to be opened. Attempting to prise one apart damages the internal coil assembly and typically results in a leaking or non-functional pod. If you want to refill with your own e-liquid you need an open system pod kit with a designated fill port.

Are prefilled pods the same as disposable vapes? No. Prefilled pods are cartridges for a rechargeable device. When the pod is empty you discard the pod but keep the rechargeable battery unit. Disposable vapes were single-use devices where the battery, pod and e-liquid were all combined in one unit and discarded together. UK regulations banned single-use disposable vapes from June 2025. Prefilled pod kits remain fully legal as they use a rechargeable battery with replaceable pods.

Can I use Celtic Vapours nic salts in a closed pod system? Not directly. Celtic Vapours nic salts are bottled 10ml e-liquids designed for use in open refillable pod kits. Closed pod systems only accept the manufacturer's own prefilled pods. To use Celtic Vapours nic salts you need an open pod system with a fill port. Any refillable pod kit from Celtic Vapours is compatible with the full Celtic Vapours nic salt range.

How many times can I refill an open pod before replacing it? Most open pod systems allow five to fifteen refills per pod before the coil inside degrades and produces a burnt or muted flavour. The actual number depends on the sweetness of the e-liquid (sweeter liquids caramelise on the coil faster), how frequently you vape and the coil design. Signs that a pod needs replacing are a burnt taste, visibly darkened e-liquid in the pod or noticeably reduced flavour and vapour production.

Do open pods leak more than closed pods? Modern open pods with silicone bung fill ports have minimal leaking issues when filled and stored correctly. The main cause of leaking in an open pod kit is overfilling (filling above the maximum fill line), leaving the pod on its side for extended periods or using e-liquid that is too thin for the coil. Closed pods very rarely leak because there is no fill port and the liquid is factory-sealed. For practical daily carry both formats are reliable.