Three pouches, one closure, three size points
OpTech builds the Fold-Over Pouch as a family, and the model numbers are the size ladder: 303, 304 and 306. All three use the same soft neoprene body and the same attached fold-over top, so the real decision is which size swallows your gear without letting it rattle around.
One honest limitation up front: the supplied records name the pouch sizes in the model titles but do not list a separate internal or external dimension table. Treat the model number as your size reference and check the product listing for the stated size before you buy, rather than assuming a measurement that is not published here.
What the 303 is built to hold
- OpTech Fold-Over Pouch 303 (3''x3''): The #303 black Fold-Over Pouch from OP/TECH is described as a lightweight way to store a small lens, adapter, mount or other little accessory. This is the smallest-sounding job in the family: single small items rather than a full lens kit.
OpTech Fold-Over Pouch 303 (3''x3'') - OpTech Fold-Over Pouch 303 (3''x3''): The pouch is made from rugged neoprene that helps keep dust, dirt and moisture off your gear. Neoprene gives you padding and a barrier in one soft layer, which matters when the pouch rides loose in a larger bag.
- OpTech Fold-Over Pouch 303 (3''x3''): The material is non-abrasive and contains no metal or other material that might damage the surface of whatever you are storing. If you are storing an adapter or mount with exposed threads or contacts, a hardware-free interior is the safer choice.
How the fold-over top actually secures
The closure is the same idea across the family, and it is worth understanding before you compare sizes. On the 303, you cup your fingers around the top cap portion and fold the top over the pouch body, then turn the pouch upside down to completely secure the top. The top is attached to the main body, so there is never a concern about losing it.
On the 304 and 306, the supplied description makes the same point in different words: the fold-over closure has no abrasive hardware and stays attached to the main body at all times. That attached lid is the practical difference between this design and a drawstring or zip pouch, where a lost cap or a metal pull can become the weak point next to your glass.
The 304: the middle size for mirrorless glass
- OpTech Fold-Over Pouch 304 (3''x4.5''): The black Fold-Over Pouch from OP/TECH USA is described as a convenient way to store and protect small lenses, mounts, converters, adapters and other miscellaneous items. The 304 is pitched at the same small-accessory jobs as the 303, but as the middle model it is the one to check first for a compact mirrorless lens.
OpTech Fold-Over Pouch 304 (3''x4.5'') - OpTech Fold-Over Pouch 304 (3''x4.5''): The soft, durable neoprene construction protects delicate gear against dust, moisture and impact. Impact protection is explicitly part of the 304 description, which supports using it as a padded wrap inside a larger camera bag.
- OpTech Fold-Over Pouch 304 (3''x4.5''): The listing states it fits mirrorless lenses and other small accessories. That is the clearest fit statement in the supplied records, so the 304 is the safest starting point if your gear is a small mirrorless lens.
The 306: the longest of the three
- OpTech Fold-Over Pouch 306 (3''x6.0''): The 306 is listed as the Fold-Over Pouch in the same neoprene, fold-over family, with an attached lid and no abrasive hardware. It shares the closure and material advantages of the other two, so the choice comes down to length rather than features.
- OpTech Fold-Over Pouch 306 (3''x6.0''): The supplied description for the 306 repeats the family wording about fitting small lenses, mounts, converters, adapters and miscellaneous items. The 306 is still a small-accessory pouch, not a full lens case; do not read the higher model number as a jump to a large telephoto sleeve.
303 vs 304 vs 306 at a glance
The table below sticks to what the supplied records confirm. Where a detail is not published, it is marked as such rather than filled in with a guess.
- OpTech 303: Smallest model number in the family; described for a small lens, adapter, mount or other little accessory. Non-abrasive, metal-free material. Fold-over top attached to the body.
- OpTech 304: Middle model; the listing explicitly states it fits mirrorless lenses and other small accessories, with neoprene protection against dust, moisture and impact.
- OpTech 306: Longest model number; same neoprene body and attached fold-over closure, described for small lenses, mounts, converters, adapters and miscellaneous items.
- Published dimensions: Model titles in the supplied records include size figures, but no separate internal or external dimension table is provided. Confirm the stated size on the product page before ordering.
- Closure hardware: All three use an attached fold-over top with no abrasive hardware; none of the supplied records mention a zip, drawstring or metal clip.
Matching the pouch to what you carry
- Start with the item, not the number: Write down what you actually need to protect: a small prime, an adapter, a mount, a converter or a spare battery-sized accessory. The 303 is described around small single items, while the 304 carries the explicit mirrorless lens fit statement.
- Use the 304 as your default for mirrorless glass: Because the supplied 304 record states it fits mirrorless lenses and small accessories, it is the most defensible first pick when you cannot measure your lens against the pouch.
- Go longer only when you need length: The 306 sits at the top of the model ladder in the supplied records. Choose it when your accessory is longer than what a middle pouch comfortably takes, and confirm the listed size before checkout.
- Plan for a pouch inside a bag, not as a standalone case: These are soft neoprene pouches with fold-over tops, not hard cases. They protect against dust, dirt, moisture and impact while nested in a larger camera bag or backpack.
What the supplied information does not settle
None of the three records includes a compatibility chart tying a specific lens model to a specific pouch, and none lists internal depth, diameter or weight limits. That means no one can honestly tell you from this evidence alone that a given lens fits the 304 but not the 306.
The practical workaround is simple: measure your lens or accessory, compare it with the size stated on the product page for the model you are considering, and allow a little room for the neoprene to wrap rather than stretch tight. If your gear sits right at the boundary between two models, the larger pouch gives you margin, while the smaller one keeps the item from sliding around.
One more limit worth stating plainly: the records do not describe water resistance ratings, strap attachments or belt loops for these pouches. If you need a pouch that clips to a belt or hangs from a sling, check the listing for those features rather than assuming them.
