Hollis ST System (ST35) review- buoyancy, weight, harness, materials, uses, limitations, and estimated average price in 2026. AquaExposure by Benjamin Coste.
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A buoyancy compensator doesn't become good simply by adding up technical features. It becomes useful when it stops occupying the diver's mind. The Hollis ST System (ST35) falls into the backplate + wing category and makes a specific promise: to serve an advanced recreational, technical, and travel diving practice. This guide is not a substitute for a trial, but it helps you understand exactly what this model offers and what problems it doesn't solve. [1]
The question isn't whether this BCD is inherently good, but rather whether it suits your tank, thermal protection, weighting, accessories, and skill level. As a backplate + wing system, this model separates the structure, harness, and bladder. This modularity can support progression, provided you verify the assembly, weighting, and wing size before changing configurations. [2] [3]
| Criterion | Value |
|---|---|
| Overall AquaExposure Score | 3.9/5 |
| G1 Buoyancy | 4.3/5 |
| G2 Weighting | 2.5/5 |
| G3 Storage | 3.3/5 |
| G4 Harness | 4.3/5 |
| G5 Materials | 4.3/5 |
| G6 Versatility | 4.5/5 |
| Average Price (estimated 2026) | €574, calculated based on a new price range of €499 to €649 |
| Suitable for | Advanced recreational diving, technical diving, travel |
| Less suitable for | Complex Solo harness to adjust, No integrated weight pockets |
Average Price (estimated 2026). The amount of €574 is an arithmetic average of the available new price range. It is neither a real-time price nor a commercial promise.
The stated buoyancy is 15.9 kg, which is 35 lb. This value should not be considered in isolation. It covers the negative buoyancy of the complete configuration, including the cylinder, gas, wetsuit, weights, and accessories. An insufficient value may reduce comfort at the surface. An excessive value does not automatically make a dive safer. [4]Highly modular system- choose between an aluminum (travel) or steel (cold water) backplate, and either the ST22 or ST35 wing. An excellent entry point into the backplate/wing system world. Metal D-rings are included. The Solo harness requires patience to adjust. This assessment gives the Hollis ST System (ST35) a G1 score of 4.3/5. Trim and buoyancy control must be checked under actual diving conditions, not just in shallow water. [1]
This model does not include an integrated quick-release weight system in the described configuration, with a stated capacity of 0 kg. It includes 2 trim pockets. This distribution can help adjust your buoyancy, but it doesn't replace proper weighting procedures. Weights should always be easily accessible and appropriate for the environment. [3]
The G2 score of 2.5/5 reflects the carrying capacity and logic of this model. Before purchasing, verify the actual functionality of the pockets with your own weights and your usual wetsuit.
The Hollis ST System (ST35) includes 0 storage pockets and 5 metal D-rings. The specifications describe these attachments as 5 stainless steel D-rings. This information is important when carrying items such as a redundant gas source, a reel, a light, or a camera housing. [1]
The G3 score of 3.3/5 does not evaluate the absolute volume of a pocket. It expresses the suitability between the available attachment points and accessories typically associated with advanced recreational, technical, or travel diving.
The G4 score of 4.3/5 reflects the potential for adjustability in this design. A test dive should confirm that the straps don't pull, the waistband doesn't ride up, and the controls remain accessible when the BCD is inflated.
The stated weight is 2.8 kg, and the construction is advertised as ballistic nylon. The D-rings are made of metal. These details indicate expected durability, resistance to wear and tear, and ease of transport, but they alone cannot determine the longevity of a specific unit. [1]
The G5 score of 4.3/5 reflects this assessment of the materials used. The actual condition of a used BCD, including any repairs, servicing history, inflators, and purge valves, should be checked independently of the year it was manufactured or the brand's reputation.
The configuration is advertised for advanced recreational diving, technical diving, and travel, suitable for warm, temperate, and cold water conditions. The specifications indicate compatibility with a twin-tank setup but no declared sidemount compatibility. Therefore, its practical use is primarily limited to twin-tank configurations. [1]The G6 score of 4.5/5 indicates its ability to adapt to changes in diving practices, but it does not suggest that a single configuration is suitable for everyone. Any progression towards technical diving remains dependent on training, proper assembly, and careful setup.
The first check concerns buoyancy. With a declared buoyancy of 15.9 kg, the Hollis ST System (ST35) needs to be adjusted to your actual configuration. A thicker wetsuit, a steel tank, saltwater, a housing or a light can significantly alter the required buoyancy. The right decision starts with checking your weighting at the end of a dive, not by following a general rule. [4]
The second check concerns comfort. This model comes with either the Solo or Elite harness (your choice). Wear it with your usual thermal protection and then, while submerged, check your breathing, access to purge valves, the direct system, and the position of the tank. A poorly fitted vest adds a mental burden that the diver should be dedicating to their surroundings and their dive buddy. [2]The third aspect to consider is usability. Like backplate and wing systems, this model separates the structure, harness, and bladder. This modularity can be beneficial for progression, but it's essential to verify the assembly, weighting, and wing size before changing configurations. The identified strengths – highly modular (aluminum/steel, ST22/ST35), 5 metal D-rings, compatible with twin cylinders, good value for money – should be weighed against the limitations: complex Solo harness to adjust, no integrated weights. The average indicative price of €574 in 2026 is a point of comparison, but never a safety criterion.
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The stated buoyancy, price, and rating do not replace a test dive, a weight check, or appropriate training. Any modification to the cylinder, wetsuit, weights, or accessories requires re-verifying the configuration. For backplate + wing systems (horseshoe style), the correct approach is to understand the equipment before entrusting it with responsibilities that it cannot handle alone. [2] [3] [4]
To compare this model with other equipment, see our general guide to AquaExposure diving tools.
The AquaExposure comparison tool should link to this review with the call-to-action "Read the full review.". In return, this review links back to the model's card at this placeholder address: see the Hollis ST System (ST35) in the comparison tool.
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The estimated average price for 2026 is €574, calculated from a new range of €499 to €649. This figure is an estimate and not a real-time selling price.
The Hollis ST System (ST35) is designed for advanced recreational, technical, and travel diving. It is recommended for intermediate, advanced, and technical divers, primarily in warm, temperate, or cold water conditions.
You should verify the harness fit, access to purge valves, weight distribution, size, condition of the D-rings, and how the BCD performs with your complete gear configuration.
[1]: https://www.hollis.com/product/st-system/ "Hollis ST System (ST35), manufacturer or distributor specifications" [2]: https://scubapro.johnsonoutdoors.com/eu/fr-fr/blog/choisir-le-gilet-le-plus-approprie-votre-style-de-plongee "SCUBAPRO, choosing the right BCD for your diving style" [3]: https://www.divessi.com/fr/blog/scuba-diving-bcds-explained-2425 "SSI, BCDs explained" [4]: https://8diving.com/halcyon-wing-size-lift-capacity-explained "Halcyon and Eight Diving, understanding wing size and lift capacity"
© 2026 AquaExposure. All rights reserved. Reproduction prohibited without authorization.
The average indicative price for 2026 is €574, calculated from a new retail range of €499 to €649. This figure is not a real-time selling price.
The consolidated datasheet indicates a buoyancy of 15.9 kg or 35 lbs. This value must be compared to the actual weight added for weights, the tank, thermal protection, and any accessories being used.
The Hollis ST system (ST35) is designed for advanced recreational, technical, and travel diving. It's suitable for divers of intermediate, advanced, and technical levels, primarily in warm, temperate, and cold waters.
You need to check the harness, access to the dump valves, weight distribution, size, condition of the D-rings, and how the BCD performs with your complete gear setup.
