The Convertube is one of our most popular products, allowing you to use (almost) any bottle as a fully functional hydration system. But what does ‘almost’ any bottle mean and which flasks and bottles are indeed compatible? And how can you find out? Here’s the full answer and some background.
You want to be able to sip hands-free from the Helix bite valve, hiking or biking along the trail – but you’re not ready to trade your favorite water bottle for a hydration bladder? Enter the Convertube! It is an invention as simple as it is genius: A flexible straw that adapts to the bottle’s depth, connected to the usual drinking tube and bite valve.
But as with any so called ‘simple’ product, there is a host of details that need to be just perfect, in order to perform as expected – and beyond expectations. The Convertube has been in the market for years and is popular with adventurers in the outdoor and tactical outdoor market, and it has been tested with countless different bottle types.
Which bottles are compatible
The Convertube kit includes four different adapters providing compatibility to many standard size caps AND cap-threadings. But as many bottle types out there have their own cap size and threading, it does not fit ALL bottles – and we can’t guarantee that it will fit YOUR bottle (unless it’s one of the standard types covered and tested with the adaptors included).
The names of the included adaptors hint at the compatible bottle type: Sigg, Nalgene (63mm), Evian PET and Standard PET. And as many other bottles have adapted these cap-sizes, the Convertube will fit on many more bottles than we can list here.
How to check if Your bottle is compatible
If you own a canteen or bottle of a lesser known manufacturer, it can be tricky to verify compatibility without actually trying it out. If you’re wondering whether the Convertube will fit YOUR specific bottle, here’s two basic points for you to check as a start:
- What is the bottle-neck diameter?
- Is the threading inside or outside?
We suggest to write down the answers to these questions and to compare them with the Convertube’s specs available on the Convertube product page in our shop (click here). If the measurement is identical to one of the adapter sizes AND the threading is on the right side of the bottle-neck, there’s a good chance that the Convertube will fit your bottle. BUT it can’t be guaranteed, as the size and density of the threading can vary.
Is there a way to test if it fits my bottle?
First you should verify that the size and threading of the bottleneck in question fits the description of one of the adaptors provided (see above). Once that checks out, here’s another indication that the Convertube will fit perfectly: If any other accessories like special caps or water filters fit the threading, the Convertube will most likely also fit.