Quick answer
No, bkr straws do not fit every bottle size. Each set is cut for a specific volume—250ml (8oz), 500ml (16oz), or 650ml (22oz)—and must be paired with the matching bkr Straw Cap for that bottle.
Why straw length matters more than bottle diameter
A straw that's too long will hit the bottom and kink or push the cap loose; one that's too short won't reach the liquid once the bottle is half empty. bkr solves this by making straws in three lengths that correspond to the three bottle volumes. The straw cap itself is shared between the 250ml and 500ml bottles, but the straw length is not interchangeable between those sizes.
The shared cap can cause confusion
The bkr 250/500ml Straw Cap fits both the 250ml and 500ml bottles, so you might assume one straw set works for both. It doesn't: the 250ml straws are shorter than the 500ml straws. If you use 500ml straws in a 250ml bottle, the straw will rest on the bottom and may block the valve; if you use 250ml straws in a 500ml bottle, you'll lose the last few ounces to the unreachable bottom.
What about the 650ml Demi bottle?
The 650ml Demi bottle uses its own straw length and does not share the 250/500ml Straw Cap. The Moonshadow Demi straw set is sized specifically for 650ml bottles. Using a 500ml straw in a Demi bottle will leave a gap at the bottom, so you won't be able to finish your drink without tilting.
Frequently asked questions about bkr straw compatibility
Will 16oz straws fit my 22oz bottle?
No. The 16oz straws are shorter than the 22oz straws, so they won't reach the bottom of a 22oz bottle. Use the 22oz set instead.
Can I use the same straw cap for 8oz and 16oz bottles?
Yes, the bkr 250/500ml Straw Cap fits both the 250ml (8oz) and 500ml (16oz) bottles. But you still need the straw length that matches the bottle volume. Buy the straw set that matches your bottle size, not just the cap.
Do I need a special cap for the 22oz Demi bottle?
Yes. The 22oz Demi bottle does not use the 250/500ml Straw Cap; it requires its own cap (sold separately) and the 650ml straw set.
How do I know which straw size I have?
Check the packaging or the product listing. bkr straws are labeled by volume: 250ml, 500ml, or 650ml. If the label is missing, compare straw length against a known bottle.
Can I cut a longer straw to fit a smaller bottle?
bkr does not recommend cutting silicone straws because the cut edge may be rough and the straw may no longer seal properly in the cap valve.
Straw sets by bottle size
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MOONSHADOW DEMI BOTTLE STRAWS 650ML (22OZ) SET OF THREE: Set of three silicone straws sized for 650ml (22oz) bkr bottles. These are the correct replacement straws for your 22oz Demi bottle; shorter straws won't reach the bottom.
MOONSHADOW DEMI BOTTLE STRAWS 650ML (22OZ) SET OF THREE
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FROST LITTLE BOTTLE STRAWS 500ML (16OZ) SET OF THREE: Set of three silicone straws sized for 500ml (16oz) bkr bottles and designed for the bkr 250/500ml Straw Cap. Use these with your 16oz bottle and the shared straw cap; they won't fit the 22oz Demi.
FROST LITTLE BOTTLE STRAWS 500ML (16OZ) SET OF THREE
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MARTINI & MANI TEENY BOTTLE STRAWS 250ML (8 OZ) SET OF THREE: Set of three silicone straws sized for 250ml (8oz) bkr bottles and designed for the bkr 250/500ml Straw Cap. These are the shortest bkr straws, so they suit the 8oz bottle without hitting the bottom.
