OMS Sizing Guide
OMS technical diving equipment is designed around adjustability rather than fixed body sizes.
Harnesses
The OMS Comfort Harness is one size and adjusts to fit divers from approximately XS through XXL. The adjustment guide is printed inside the shoulder pads, and the webbing can be trimmed to fit after adjustment.
IQ Lite Systems
IQ Lite backpack/harness systems are offered in multiple sizes. Sizing is based on torso length, and the shoulder and waist webbing adjust over a wide range. If you are between sizes, we recommend the larger size when diving thick exposure protection (drysuit or 7mm wetsuit).
Wings
OMS Performance Mono and Double wings are sized by lift capacity (buoyancy), not body size. Choose lift based on your tank configuration and ballast requirements — not your clothing size.
SlipStream Fins
SlipStream fins are sized to be worn over drysuit boots or thick neoprene boots. If you are between sizes or diving a drysuit with rock boots, we recommend sizing up.
Not sure which size fits you best? Contact us — we fit OMS gear in store every week and are happy to help.
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Product Information
The OMS IQ Lite CB is an ultra-light version of the classic OMS IQ backpack harness, built as a modular foundation for a wing-and-harness dive system. At approximately 2.4 lbs (1.1 kg), it packs down small enough to fit into a carry-on bag, making it a practical choice for travel diving while retaining the adjustability and load-carrying ability of a technical harness. Anodized aluminum hardware throughout maximizes strength while keeping overall weight to a minimum.
The CB designation refers to the integrated cummerbund, a wide hook-and-loop belly band that spreads the load across the waist for added support and stability, paired with drop-in weight pockets for integrated ballast. A soft, padded backpad and shoulder epaulettes add comfort under a loaded rig, while aluminum D-rings and a crotch strap with quick-release clip provide secure attachment points for accessories and stage bottles. Following the OMS modular design approach, the harness pairs with the diver's choice of wing and can be adapted for single tank or doubles use, and a rear pocket accommodates a backplate. The system can be reconfigured from warm-water travel diving to cold-water use by fitting a wing with the appropriate lift. Available in XS, S, M/L, and XL.
- Ultra-light harness at approximately 2.4 lbs (1.1 kg), packs into a carry-on bag
- Integrated cummerbund (CB) belly band distributes load across the waist for added support
- Drop-in weight pockets for integrated ballast
- Anodized aluminum hardware maximizes strength while minimizing weight
- Welded aluminum D-rings for attaching accessories and stage bottles
- Crotch strap with quick-release clip for secure positioning
- Soft padded backpad and shoulder epaulettes for comfort under load
- Rear pocket accommodates a backplate for doubles configurations
- Modular OMS design pairs with the diver's choice of wing for single tank or doubles
- Converts from warm-water travel use to cold water by fitting a wing with appropriate lift
- Available in XS, S, M/L, and XL
| Brand | OMS (Ocean Management Systems) |
| Model | IQ Lite CB Harness |
| Product Type | Backpack harness system for wings |
| Weight | Approximately 2.4 lbs (1.1 kg) |
| Hardware | Anodized aluminum D-rings and belt buckle |
| Cummerbund | Integrated hook-and-loop belly band |
| Weight System | Drop-in weight pockets |
| Crotch Strap | Included, with quick-release clip |
| Padding | Soft backpad with shoulder epaulettes |
| Backplate | Rear pocket accommodates a backplate (sold separately) |
| Wing | Not included; pairs with OMS wings for single tank or doubles |
| Sizes | XS, S, M/L, XL |
| Use | Travel, recreational, and technical diving |
⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
Frequently Asked Questions
How should a scuba BCD fit?
A BCD should fit snugly enough that it does not ride up toward your ears when inflated, while still letting you breathe fully. Fasten the waist and cummerbund first, then adjust the shoulder straps so the tank sits close to your back and the shoulders cannot slide off. With the BCD fully inflated at the surface you should still be able to take a deep, comfortable breath; if it squeezes your chest, loosen it or move up a size.
How do I rinse and care for a BCD after diving?
Rinse the outside in fresh water and also flush the inside of the bladder, because salt water gets in through the inflator and dump valves. Fill the bladder roughly a third full of fresh water through the oral inflator, slosh it around, then drain it out through the inflator and each dump valve. Hang it to dry out of direct sunlight and store it partially inflated so the bladder walls do not stick together.
Should I use integrated weights or a weight belt?
Integrated weight pockets carry the lead in the BCD itself, which many divers find more comfortable and easier on the hips, while a weight belt keeps the weight independent of your BCD. Either way, you must be able to release your ditchable weight quickly with one hand, and your buddy should know how your system releases. Non-ditchable trim pockets are useful for balance but should never hold weight you might need to drop.
How do I pack a BCD for travel?
Make sure the BCD is completely dry inside and out before packing so it does not mildew in transit. Remove all weights, deflate it fully, and fold or roll it around softer items such as a wetsuit to cushion the inflator and valves. Avoid hard creases in the air cell, and unpack and air it out as soon as you arrive.
When does a BCD need to be serviced?
Follow the service interval in the manufacturer's manual, which is commonly an annual inspection alongside the rest of your life-support gear. Have the inflator, dump valves, and bladder checked any time the inflator sticks, free-flows, feels rough, or the BCD holds air poorly. Between services, confirm that it inflates and deflates properly as part of every pre-dive check.
What is the difference between a jacket-style and a back-inflate BCD?
A jacket-style BCD holds air in panels that wrap around your sides as well as your back, while a back-inflate BCD keeps the entire air cell behind you. Jacket styles tend to feel very stable and upright at the surface, and back-inflate styles keep the chest clear and are often preferred for horizontal trim underwater. Neither is objectively better, so treat it as a fit and preference decision and try both if you can.
Will my BCD fit any scuba tank?
Most recreational BCDs use an adjustable cam band sized for common single-cylinder diameters, so standard aluminum and steel tanks generally work. Re-check the band tension after the first wetting, because webbing can relax slightly and let the tank shift. If you dive doubles or unusual cylinder diameters, confirm compatibility with the manufacturer before assuming it will hold.
