Do Little Bottle Straws Fit Demi and Big Bottles? Sizes

By Reusable Glass Water Bottles with Silicone Sleeves | bkr | Published: 2026-11-03

Category: Kaufberatung

Little Bottle Straws are made for bkr 250ml and 500ml bottles with the Straw Cap. They don't fit Demi or Big bottles, so here's how to choose the right straw setup.

Quick answer

Little Bottle Straws are designed only for bkr 250ml and 500ml bottles used with the bkr Straw Cap. They do not fit Demi or Big bottles, so choose a straw set made for those sizes instead.

Why the Straw Cap decides compatibility

The straw itself doesn't attach to the bottle directly. It passes through the clear silicone valve in the bkr Straw Cap, and the cap screws onto the bottle. That means the cap size, not just straw length, determines whether a straw setup works.

If you already own a Straw Cap for your 250ml or 500ml bkr, the Little Bottle Straws are the matching replacement. If your bottle uses a different cap, check the cap's stated compatibility before buying straws.

Where Demi and Big bottles differ

Demi and Big bottles are separate bkr sizes with their own caps and accessories. Little Bottle Straws are not listed as compatible with them, and the catalog does not provide a cross-size adapter. Treat the 250ml/500ml limit as a firm one rather than a guideline.

This is also why a straw that looks long enough can still be the wrong choice: length alone doesn't guarantee a seal or a secure fit in a different cap.

What to check before you order

Confirm two things: your bottle's size in milliliters, and whether you own the bkr Straw Cap. Both need to match the straw set's stated use. If either is unclear, the safest move is to identify your cap first, because straws are sold as accessories to that cap system.

The catalog for Little Bottle Straws does not list option types such as color or pack variations, so base your decision on size compatibility rather than finish.

Little Bottle Straws: common questions answered

Do Little Bottle Straws fit Demi bottles?: No. They are designed for bkr 250ml and 500ml bottles with the Straw Cap. Demi bottles use a different setup, and no adapter is listed. Check your bottle's milliliter size before ordering.
Do they fit Big bottles?: No. Big bottles are a separate size with their own accessories, so Little Bottle Straws are not the right match. Buy straws specified for your Big bottle rather than forcing a smaller set.
How do I install them?: Screw the bkr Straw Cap onto your 250ml or 500ml bottle, then insert the straw through the clear silicone valve in the cap.
How many straws come in a set?: The CUTE BUOY BLUES set includes three silicone straws, one each in Winter, Fifth Ave., and Beau. A set lets you keep one at home, one at work, and one in your bag.
Can I use them without the Straw Cap?: No. The straws are made to pass through the Straw Cap's silicone valve, so the cap is required for the setup to work. If you don't have the cap, factor it into your purchase.

Product facts

CUTE BUOY BLUES LITTLE BOTTLE STRAWS 500mL (16 OZ) SET OF THREE: CUTE BUOY BLUES LITTLE BOTTLE STRAWS 500mL (16 OZ) SET OF THREE contains three silicone straws in Winter, Fifth Ave., and Beau, designed for 500ml bkrs and the bkr 250/500ml Straw Cap. One set covers your 16oz bottle and gives you three colors to rotate, but only if you use the matching Straw Cap.
CUTE BUOY BLUES LITTLE BOTTLE STRAWS 500mL (16 OZ) SET OF THREE