The Foundation of Every Effective EWOT Session
An oxygen reservoir bag is the core component of any EWOT setup. It stores high-concentration oxygen produced by your concentrator, building up the volume needed for a full, effective therapy session. The quality of your bag directly affects the quality of your session — and not all bags are built equally. At Optimal Breathing, our oxygen reservoir bags are manufactured from medical-grade, phthalate-free TPU — the same material used in surgical implants — delivering a level of material safety and durability that standard bags simply cannot match.
Two Sizes, Every Use Case Covered
We offer oxygen reservoir bags in two capacities — 500 liter and 900 liter. Both come complete with our patented Turbo Mega-Flow Mask and all required accessories, so you have everything you need in one purchase.
900 liter Oxygen Reservoir Bag
The high-capacity option for serious, uninterrupted EWOT sessions. Best for longer sessions, multiple users sharing one bag, and commercial settings where consistent availability matters. With a 10 LPM concentrator, the 900-lliter bag fills in approximately 90 minutes. With a 5 LPM concentrator, allow approximately 3 hours.
500 Liter Oxygen Reservoir Bag
The space-saving option for personal home use and shorter sessions. Faster to fill, easier to store, and ideal for individual users with a consistent daily routine. With a 10 LPM concentrator, the 500-liter bag fills in approximately 1 hour. With a 5 LPM concentrator, allow approximately 100 minutes.
Not Sure Which Size Is Right for You?
Here is a simple way to decide:
Choose the 900-liter bag if you want fewer refills between sessions, plan to share the bag with more than one user, or are running a commercial EWOT setup where downtime between sessions needs to be minimal.
Choose the 500-liter bag if you are a solo user with shorter daily sessions, have limited storage space, or want the fastest possible refill turnaround.
If you are still unsure, our team is happy to help you choose before you buy.
Built to the Highest Material Standards
Every Optimal Breathing reservoir bag is made from medical-grade, phthalate-free TPU — free of BPA, phthalates, and strong odours. This is not a marketing claim — it is the same material specification used in surgical implants, chosen specifically because oxygen therapy demands materials that will not degrade, outgas, or contaminate your oxygen supply over time.
- Resistant to mold, oxygen breakdown, and outgassing
- Built-in pressure relief valve prevents overfilling automatically
- No cleaning required — ever
- Mountable horizontally or vertically to suit your space
- Highly durable and built for long-term, repeated use
Compatible With Any Oxygen Concentrator
Our reservoir bags work with any oxygen concentrator on the market — your brand, your LPM output, your setup. Whether you own a 5 LPM home unit, a 10 LPM high-output machine, or anything in between, our bags integrate seamlessly. No adaptors, no compatibility issues.
Who Buys Our Oxygen Reservoir Bags?
Our bags serve a wider range of buyers than you might expect:
- Replacement & upgrade buyers — existing EWOT users replacing a worn bag or upgrading from a 500-liter to a 900-liter for longer sessions.
- DIY EWOT builders — buyers who already own an oxygen concentrator and want to build their own EWOT system. Our bag and mask bundle gives you the two components you cannot easily source elsewhere, combined into one purchase.
- Component-only buyers — individuals who have sourced their concentrator separately and need the rest of the system. Our bag and mask bundle completes your setup without duplication.
- Commercial operators — gyms, wellness centres, and biohacking studios needing reliable replacement bags for high-frequency daily use.
About the Mask — Included With Every Bag
Every reservoir bag purchase includes our patented Turbo Mega-Flow Mask — the same dual-inlet mask included in our complete EWOT systems. You do not need to purchase the mask separately.
The mask is available in small, medium, and large sizes. To keep it in optimal condition, clean it regularly using this simple method: soak in a 3% hydrogen peroxide solution for 5–10 minutes, ensuring all surfaces are fully covered, then rinse thoroughly with clean water and allow to air dry completely before use. The bag itself requires no cleaning.
Buy Oxygen Reservoir Bags With Confidence
Both sizes ship free across the 48 contiguous US states. Every bag is rigorously tested before dispatch. Whether you are building your first EWOT setup, replacing a bag, or equipping a commercial facility, you are covered.
