The Duro LT and Dyna LT vests are minimalist additions to Osprey’s long-standing Duro (men’s) and Dyna (women’s) running hydration lineup. They are designed to carry the bare necessities for distance training such as water, keys, phone, a little fuel and a lightweight layer. The LT vests are something of an in-between option if you want to carry more fluid than a waist bottle can manage but don’t want the increased weight of a traditional vest. They also include a number of design and construction updates that the company introduced across its entire Duro and Dyna lines in 2022, such as increased size ranges, improved women’s-specific fit and wider flask openings.
Primary functional storage on the Duro LT and Dyna LT is on the front of the vest which comes with two 360ml soft flasks that are secured by a stretch mesh pouch and bungee cord ring around the neck of the flask. The volume of these flasks is smaller than standard hydration vests, but this is in keeping with the minimalist design. Larger 500ml flasks would add additional weight and increased bounce, particularly because the overall vest material doesn’t have much compression. The smaller flasks that come with this vest provide just enough fluid and are positioned perfectly to drink from without having to remove them from the pouch.
In addition to the flask pouches, there is a vertical zip pocket on the left front side of the vest that can accommodate most smartphones. The pocket is secure, but larger items tend to protrude if the hydration flask underneath is full. Dual trash pouches below the flasks provide small storage options, but we wanted these to be just a bit taller to accommodate gels or food items. However, these pouches include thoughtful elements we appreciate: the right side has an easy-to-access key clasp (a detail that is too often overlooked), while the left side has a safety whistle in case of emergency.
Rear storage consists of a single, pass-through pocket that can be accessed from either flank. It’s intended for storing a jacket or top layer and works very well for this purpose, while smaller items on their own tend to migrate around if the rear compartment isn’t resting snug against your back.
Material construction for the fabric that comes in contact with the body is a thin 3D Spacermesh that rests lightly against the surface while pulling moisture off the body. It is also highly ventilated for enhanced air flow. The minimal footprint across the back, comparable to a racerback tank top design, diminishes heat absorption very well, which was appreciated by our testers who sweat more heavily across the back. Osprey also utilized its updated 3D tailoring to adjust the dimensions and footprint of the women’s Dyna version, as they have done across the entire line.
Duro and Dyna LT vests each come in three sizes and we found them to be more generous than other vests we’ve used. Choosing the proper size is critical because aside from two sternum clasps, there is no way to secure the vest against your body. If the fit is too large, the vest will move around more than you want and possibly cause the unsecured cargo in your front and rear pouches to drift. For future versions, we would suggest a small strap or cord around the torso to compress the vest against the body more effectively. Otherwise, we recommend going with a smaller size if you are in-between or uncertain.
- Duro LT size L, with empty flasks: 10.1oz
- Dyna LT size L, with empty flasks: 8.8oz
- Hydration capacity: 2x 360ml soft flasks (included)
- Two stretch mesh soft flask harness pockets
- Two lower stretch mesh food/supplement harness pockets
- Vertical zippered harness pocket
- Snap-in adjustable/removable dual chest straps
- Tuckaway safety whistle and key clasp
- Large, dual entry, stretch mesh rear pocket
- MSRP: $85