What is it made from?

I am only a purchaser so I don't know the technical answer. It is a rubbery material that folds down. It has a more rigid band that is heat proof and allows you to hold the cup safely.

The description states that it doesn’t leak- if full can you keep it in your bag without getting coffee all over then place.

No. Only a proper thermos flask should be 100% leak-proof. If you use it normally, or put it in a mug holder in a moving vehicle (providing you're not driving like a maniac, or over rocky ground) then it should remain leak proof, bearing in mind it has a small hole so that the user can drink out of it when the lid is on. If it's too full then it will spill a little coffee out of the top, so don't fill it to the brim, but that's common sense anyway.

Will popular high street coffee chains make your drink in this cup?

Yes. I have had this cup for 4 Year's and all coffee shops have filled it without refusal. How ever I always advise them how to hold the cup and put the lid on myself as coffee shops are use to push on lids and had a couple of close calls.

What size starbucks (or other coffee chain) take away coffee fits in this mug?

I know this is an old question and many have answered it, but I thought it might be worth giving some numbers to confirm it. Pokito's largest size is 475ml (16oz). This will take a Starbucks "Grande" (473ml). It won't take ALL of a Costa "Massimio" (496ml) but I think most baristas would just serve it slightly short. Pokito's middle size is 350ml (12oz). This will take a Starbucks "Tall" (354ml) just about. Again, it won't take ALL of a Costa "Medio" (364ml) but is close enough for most people. Pokito's smallest size is 280ml (8oz). This will take Starbuck "Short" (267ml). It will take a Costa "Primo" (276ml). Pokito cannot take a Starbuck "Venti" (591ml), but if you drink your coffee in pints you've got bigger problems than whether it'll fit in your rubber cup ;) If you get your coffee from Pret, their sizes seem to vary from drink to drink. Long drinks like Lattes and Americanos are 330-350ml so will fit in Pokito's middle size. The Flat White (250ml) and Cappuccino (280ml) will fit in Pokito's small size. One thing to bear in mind is that most baristas won't accurately measure things and will rely on a mixture of intuition and the size of their cups. So if, for example, you ask for a Medio Latte in Costa but give them your Pokito fully expanded, there's a good chance you'll get more than 364ml. It'll still only have 2 shots of espresso though, so the extra milk may make it a little weak. Also worth noting that the Pokito has measurement markings at 475ml/16oz and 230ml/8oz. It has no 350ml/12oz mark, presumably because, as 350ml is achieved by collapsing the bottom half, the marking would basically be at the top along size the 475ml mark, which could be confusing.

Item diameter	4.5 Centimetres
Specific uses	Cold Drinks, Hot Drinks
Is mould resistant	Plastic, Metal
Care instructions	Dishwasher Safe
Is assembly required	No
Number of pieces	1
Batteries required	No
Included components	Lid
Item weight	0.13 Kilograms

pokito Pop Up/Collapsible/Reusable/Eco-Friendly/Folding 3-Sizes-in-1 Travel Cup/Mug with Leak-Proof Lid for Hot and Cold Drinks (Fits in Pocket or Bag; Great Gift for Coffee or Tea Lovers), Blueberry

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