Thinkbaby Thinkster of Steel Straw Cup 9 Oz.

  • $14.00


  • Free of Bisphenol-A (BPA), phthalates, nitrosamines, lead, PVC, PET,  and biologically harmful chemicals.
  • No spill straw!!! – features our cross cut design. 
  • Extra soft, medical grade silicone, straw provides easy transition from sippy cup to the next stage of feeding straw bottles. 
  • Perfect for 16 to 48 months
  • Comes with easy to close swivel top – reduces chance of spillage during travel and protects the straw from coming into contact with foreign substances.
  • Dishwasher safe (Top rack recommended).
  • Base of the bottle made from ultra polished 304 stainless steel (18/8).
  • The Thinkster of Steel and the original plastic Thinkster are almost identical in weight!

The base of the bottle is made from ultra-polished 304 stainless steel (18/8).  All plastic components are made from polypropylene.  We were the first company to have a 100% BPA free baby bottle line.  The materials we use are also free of BPA, BPS, phthalates, PET, PS, PA, nitrosamines, melamine, dioxins and biologically harmful chemicals.  We conduct regular testing to ensure the safety of our products.  The nipple is made from medical grade silicone.

Do we conduct animal testing?

We do not conduct animal testing on any of our products.  All of our testing is either chemical testing or biological testing (on cells).  We utilize third-party globally certified laboratories to conduct our testing.

How do I care for my Thinkster of Steel?

Thinksters are dishwasher safe (Top Rack recommended).  The markings are embossed into the metal so they will not come off. The logo is laser etched into the material.  We do not use lead in our paint, which is what predominately makes paint stick.  The US and EU standards actually allow for low levels of lead.  We specifically do not want lead in our products. 

When washing thinkster in the dishwasher, we recommend using a detergent that is free of chlorine.  Most of the natural detergents on the market from Eco Lever to Seventh Generation should be free of toxic chemicals.  If hand-washing, the American Pediatrics Association suggests using warm soapy water, but only if you live in an area with treated water systems.

We highly recommend purchasing a box of Thinkster replacement straws at time of purchase.  Silicone straws last between 2-3 months depending on use.  It is important to take feeding products away from little ones after they have finished eating, so that they are not confused with chew toys.  

Replace straws if they become worn or broken.

Before first use:

We recommend sterilizing the Thinkster of Steel in boiling water for 2 to 5 minutes before first use.  We do not recommend utilizing sterilizers, as we cannot guarantee that the ones on the market were made with safe materials.  The Thinkster of Steel is NOT microwave safe. In fact, we strongly suggest that parents do away with the use of microwaves for all items and products destined for your little one.

How do I convert the Thinkbaby Sippy into the Thinkster?

One of the great things about the Thinkbaby system is that you can convert the bottles to the next stage of feeding.

Baby bottle into The Sippy: 

Simply purchase the Thinkbaby Conversion kit. To convert, remove the baby bottle nipple and replace with the Sippy Cup spout.  Then place the Sippy Cup handles around the top of the baby bottle and push down over the neck of the bottle.  Tighten the collar with spout around the neck of the bottle and….presto chango you have our award winning Sippy Cup!!!  

The Sippy into The Thinkster:

Simply purchase the Thinkster Conversion Kit.  Take collar off of baby bottle (along with spout) and screw on the Thinkster top. Presto chango - The Thinkster!

    We recommend using the Sippy of Steel with our Made-from-Limestone Neoprene Sleeve, available for purchase now.