I bought the two-pack of this after buying the two-pack of the 500ml size and finding that size just a tad too small for my liking (even though 500ml should be plenty of liquid!), and this 700ml size has quickly become my favourite out of all the reusable cups I've purchased from this shop. I've used it for iced lattes and iced matcha lattes for a no-spill risk at my home office setup, and I've also taken it on the go from home to the office. I prefer these to the glass cups if only because the plastic makes it a lighter weight, easy to fit in my bag, and I don't have to worry about it banging around a teensy bit, though not too much, of course... I've used these cups at multiple bubble tea shops around Metro Vancouver, but as mentioned they're good for more than just bubble tea! I've never experienced a leak using these cups, but I have experienced overflow, so beware that you don't fill your cup too high; if a bubble tea shop fills it too high, just take a few gulps before tightening the lid or else you're really risking a mess. Another thing is that you should be careful putting the silicone stopper in since it could pop out if you're pressing it closed at an angle. It's easy enough to pop back in properly, but it's important to have it on right so that you are leak-free! If you're debating which of the cups to order, you're looking for a gift or you can only order one cup, this is the one that I'd recommend!
Aside from the product, I love that Carrie ships her products with eco-friendly materials. I appreciate it a lot, especially in our world where multinational corporations can't be bothered to spend a little extra on eco-friendly and/or biodegradable packing materials. Shipping has always been fast for me, but I live in the metro area where Reusable BBT Cup is based, so I never have to wait long or pay much. Even though we're used to a lot of free shipping with big corporations like Amazon, shipping is not actually free, and so I don't mind paying for shipping, knowing that it lessens the cost impact for this small business that I love.