Topeak have a huge range of bags for bicycles, from rack bags to bar bags and everything in between. In fact the old version of this very bag was my very first frame bag on a gravel bike back in 2018ish when I was riding a 1st gen Trek checkpoint, which was the demo gravel bike of the bike shop I was working in at the time. That was a great bag and lasted quite a while until me repeatedly overstuffing it finally broke the zip. lets see if this latest model is as versatile as its predecessor.The midloader comes in 3 sizes, the test size is a large at 52.5 x 15 x 6 cm and weighs 216g on my un-varified kitchen scales. It comes in one colour-black, with a black interior. It is made of a TPU polyester fabric that Topeak claim is good for an all-weather adventure experience the zips are also weatherproof. There are two compartments each with a full length zip. these zips are single ended, meaning if an item you want is at the end of the bag away from the zip start you have to fully open the entire bag to get to it. The midloader is attached to the frame by a series of velcro straps at various points along the top of the bag, the rear and underneath to fit around the bikes downtube.Both the compartments are plain inside, there are no mesh pockets or zipped areas withing to keep small items, such as keys from being lost with everything else inside the bag. That being said though, the bag has a very generous 4.5L capacity. The midloader is stiffened along the top and bottom and this helps the bag keep its shape when carrying heavier items (up to 4kg). The outside of the bag has an understated graphic design that is reflective which is handy as the sides of the bike are the least visible at night as no one runs side marker lights.The bag is a wedge design which in theory means any loose or small items should make their way to the front of the bag. As you can see above my Fustle Causeway gravel bike has quite a radically sloping top tube and I can just fit a small bottle in the forward cage without it being too much of a chore to get it in and out. You need to take this into consideration when choosing the size of bag you can fitSix months on from fitting the midloader bag it has held up to everyday use very well. its taken a few knocks but cleans up with simple soap and water. It has withstood me deliberately trying to over fill it and the zip remains intact and working like new. You can fit a LOT of stuff inside the larger compartment and the smaller side will easily take a modern smart phone. I generally kept my phone, multitool, house key, tubeless repair tool and money in that side so they were easier to get to and not lost in the bigger side. The big side took a waterproof, my gopro with minitripod, microphone, spare tube and various items of pastry and sandwiches. The bag stayed attached and didnt swing around over rough ground or inept cornering even with heavy items in it (itll carry 4 cans of beer nicely). Id recommend you protect your bike paintwork though as even as steady as it is there is some movement of the straps that might grind any dirt or grit that collects under them into your paint job.The things i think could be inproved are the zips. id like a double ended one so when riding along i could access stuff without having the entire bag open, potentially with items bouncing out. Id like the interior to not be black so you can see things inside easily and id like a few more slots to give more mounting point options.What I love about the Midloader bag is the capacity, you can carry a lot of stuff inside. its super hard wearing but remains lightweight. The big zip handles are great for cold or gloved hands to manipulate. These days a frame bag of this size can easily cost 100+ but I like the fact you can buy the Topeak Midloader for less than 65 if you shop around.When looking at the prices of the Midloader on the internet I noticed you can still buy the original version that I had back in the day for around 20 less. personally Id pay the difference and go for the latest version.you can find more about the Midloader range on the topeak website here