To be honest I have not used the extra caps yet because the original cap is still good, but i bought it for future use when the old one gets too dirty and while its washing the new one will be used :)
I have been using Equa bottles for 5 years now and love them. Few months ago I bought third bottle.
Ordered Matching caps with casings. Recieved twice of the dame colour and not the one i wanted. Over all - Good Quality and looks Good Too.
I am glad that we are able to buy additional bottle caps and silicone seals! It allows to use the bottles for longer, since glass is so durable. Very convenient, and the product was as perfect as expected.