Is the straw flexible or hard?

The straw is hard. No flexibility at all.

Can this be used with carbonated drinks (sparkling water) or smoothies?

It can be used for smoothies. I would take the cup and straw apart afterwards to clean. I have not tried sparkling water in them but these are mae for young kids and they tend to not be careful with them and I would imagine the carbonation after being tossed around or shaken would make it leak from the straw at the least.

Product Dimensions	19.2 x 17.8 x 9.4 cm; 290 g
Specific uses	Cold Drinks
Item volume	414 Millilitres
Is mould resistant	BPA Free
Finish types	Glossy
Care instructions	Hand Wash Only
Dishwasher safe?	Yes
Number of pieces	2
Batteries required	No
Included components	Bottle and Lid
Item weight	290 Grams

Leighton Kids Plastic Water Bottle, Spill-Proof Tumbler with Straw for Kids, Dishwasher Safe, 14oz 2-Pack, Blue Raspberry/Butterflies & Azalea/Llamas

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