Close-Fitting O-Rings for Bison and Nano Containers

Keep your small containers dry and ready for use with a set of o-rings that fit most bison and nano containers. The package contains 10 pieces, so you always have a spare ready when the seal is flat, cracked, or completely missing. The black o-rings create a tight seal around the lid, keeping water, dust, and dirt out, whether you're using a small capsule on your keychain or a discreet container for geocaching.

With several o-rings on hand, you can give older containers new life in just a few minutes. Place a couple in your backpack, in the car, or in the drawer at home, so you can quickly replace them when you notice the lid no longer seals properly. It's a small thing that makes a big difference in durability.

Why Replace the Seal?

Seals become flattened, dried out, or brittle over time due to changing weather, dirt in the threads, and frequent use. The signs are easy to spot: the lid feels either too loose or needs to be pressed hard, the ring looks flat, or you find moisture inside even though the container has been closed. By replacing the o-ring, you restore the elastic seal, ensuring the contents are protected again.

For those who place or maintain small containers outdoors, a fresh o-ring means fewer trips back to check for moisture and damage. You also avoid stuck lids, as a complete seal reduces metal-on-metal binding.

Easier Installation and Good Fit

Replacement takes just a moment: unscrew the lid, lift off the old ring, clean the grooves and threads of sand and dirt, and roll the new ring into place in the groove. Screw the lid back on and feel it close evenly and smoothly. To make it extra nice, you can apply a bit of silicone grease to the threads so the o-ring doesn’t pinch when you screw it on.

The o-rings are shape-stable and flexible, fitting nicely in the groove of both bison and nano lids. They take up minimal space in your pocket, and with 10 pieces in the bag, you have enough for your own containers and a few to help a friend with a worn seal.

Durability and Material

The o-rings are made from elastic synthetic rubber that retains its shape and fits snugly against the lid. The material withstands daily open-close use and the temperatures you encounter on trips throughout the year. They are designed to seal, not to decorate, and that’s why they do their job discreetly every time you screw them on.

You can extend the lifespan of the rings by storing them dry and away from direct sunlight, and by keeping the threads and grooves free of sand grains. This small habit can save you from many frustrations and unnecessary replacements of the entire container.

For Those Who Maintain Small Containers

Whether you’re checking your geocaches, carrying a small capsule on your keychain, or taking a micro-container on a walk, a tight seal is what keeps the contents in order. These o-rings are a simple solution when moisture, cold, and repeated openings have taken their toll.

The package of 10 pieces is compact, easy to carry, and provides peace of mind, as you can quickly replace them on the spot. Click on a new ring, screw the lid in, and continue your day without worrying about water in the container the next time it rains.