It has an extremely compact umbrella-style fold (measuring 15" x 30" x 13"). If you keep the wheels unlocked it's very easy to pull it along behind you or push ahead of you, and if you lock the wheels it's easy to store upright against a wall (no, it's not self-standing). The process of folding is multi-step but super quick once you get the hang of it: 1) lock all 3 front sets of wheels, 2) push seat backs forward all the way, 3) pull up 2 locking levers at back of stroller, 4) step down on the folding mechanism on the side, 5) push handles forward and down until stroller is locked shut. Once you've done it a few times it takes literally 15 seconds (much easier than trying to direct someone else how to fold it while you're getting 2 screaming kids into car seats LOL).
I love the full range of these independently reclining seats - from quite upright with a great view all the way down to nearly fully reclined and infant compatible! There's even a mesh foot enclosure that flips up and over the foot rest for newborns (of course, if using with newborns you would also want to buy and use a full infant body support pillow or at least a head support pillow - shown in use in below left photo). How you actually recline and straighten the seat is not my favorite feature, as far as I can figure it does take two hands, but it's fairly straight forward and simple (check my demo video to see it being done). There are also nice leg rests that go up and down easily. We haven't had any major grime to deal with yet, but yogurt and other snack mishaps have easily cleaned right up with a quick wipe down with a wet towel.
It has 2 decent sized storage baskets under the stroller that are only accessible from the rear and only when the seats are upright. The left and right underbaskets are separate and there's a 5 pound limit for each, so you can't fit anything HUGE or super heavy down there, but the mesh bags hang on top of the metal frame, so you can't stretch the basket out like I've had an issue with on other strollers. I decided to ditch my double diaper bag and instead pack smaller bags to go under the stroller - diapers, wipes, nursing cover and toys on the left, snacks and water bottles on the right. It's been working great!
You can also go without an add-on parent console since they have built it in for you! The back of each seat features a small zippered compartment where you can store wallet, chapstick, keys, etc as well as a small open mesh compartment good for a small water bottle or cell phone. The stroller comes with a plastic cup holder that hooks on the side, but I had a terrible time with it not staying in place (maybe I wasn't using it right?), so I gave up on it and took it off.
Finally, each seat has a little mesh pocket where you can keep stuff you want accessible to your child, such as a toy, bottle, or pacifier!
I wouldn't recommend hanging anything heavy in the back from the handles, I haven't tried and this stroller seems much sturdier than most umbrellas, but it could potentially flip the stroller backwards. If you need more storage, the SureShop bag by Hatch Things is awesome, it hangs and clips onto the side of strollers, you could even use one on each side, though it would make the stroller significantly wider when in use.
With an in-use size of 32.25" x 30" x 42.75", the TwinGroove Ultralight weighs 26 pounds, not exactly light, but as far as double strollers go it makes good on its namesake "ultralight"! I'm 5'8" and the handles are at a very comfortable height for me, and were fine for my 5' sister-in-law, too. But here's where it rocks... each seat has a whopping 50 pound weight limit, with a total weight limit of 100 pounds!! Yessssss!!!
This part probably can't be endorsed by Joovy as I don't think they've done any testing or approved any after markets such as this, but I do want to mention that we've been using it on a daily basis for a month now to carry our 18 pound twins in the seats and pull our 38 pound 4 year old on his Englacha Junior X-Rider sit/stand board. I was nervous if it would be compatible with this, and if we would somehow break or warp the Joovy's frame, but it has been kicking butt! Another reason the Twingroove Ultralight does well pulling a ride on toddler board in my opinion is because the stroller handles are independent, so there's no across-handle to get in the way of the child when sitting or standing behind the stroller.
These are great full coverage independently operating canopies, with UV protection and (small) velcro closing plastic peekaboo windows.
It also doesn't have a belly bar or snack tray as add-on options, but those are pretty standard losses in an umbrella stroller, I mean, they would take away from the compact fold! But, you can always get those velcro tethers for snack cups.
One of my favorite things about the stroller is the great view the kids have from the seat because they're not reclined deep within a pocketed seat. But, that's also a slight hazard I have found for my own very curious toddlers. It is a tight squeeze into our building's elevator and through the grocery store aisles, and there is nothing to keep their arms and legs inside the stroller. So, I have to be very vigilant, steer clear of breakables, and go slowly in and out of the elevator making sure limbs are clear.
And if you get or have the TwinGroove Ultralight, I highly recommend the Manito Elegance Alpha Stroller Shield - it creates a fabulously warm and cozy greenhouse in winter, protects them from the rain, has a front window that opens so you can hand kids snacks or give them fresh air or take kids in and out without having to remove the cover, and it fits this stroller fabulously!! We love ours!!!