BiKase MIK Compatible Trunk Bike Bag Big Daddy with MIK Attachment, Waterproof Bag for Back of Bicycles with Panniers, Pannier Rack Bag with Water Bottle Carrier (MIK Rack not included)
$169.99
Price: $169.99
(as of Oct 13, 2025 21:33:28 UTC – Details)
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Customer Reviews
4.4 out of 5 stars 73
4.4 out of 5 stars 192
4.0 out of 5 stars 30
4.4 out of 5 stars 21
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Price
$99.99$99.99 $55.81$55.81 $129.99$129.99 $24.35$24.35
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Great bag on and off the bike
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Fits many Ebikes and top bicycle manufacturers
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Maximizes your EBike’s carrying capacity
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Built with reflective accents
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Waterproof Bike Bags: Explore our line of bike bags, including waterproof options, designed to keep your belongings dry in any weather condition, ensuring you ride hassle-free even in rain or wet conditions
Trunk Mounting: Choose from our range of bike bags that mount securely on your bike’s trunk, providing ample storage space for your gear while you ride, whether it’s a long-distance tour or a short commute
Durable Construction: Our bike bags are crafted with high-quality materials to offer durability and reliability for all your cycling adventures, ensuring they withstand the rigors of the road and keep your gear protected trip after trip
MIK-Compatible Bike Bag: Tailored specifically for MIK Bike Racks, this bag offers seamless mounting and dismounting, effortlessly securing the bike while providing convenient access to your gear
Tailored for E-Bike Enthusiasts: BiKase trunk bags seamlessly attach to rear racks, offering generous storage and reflective accents to enhance safety during electrifying rides
About BiKase: Our company was born out of a desire to provide cyclists with well-designed products that address the needs of all types of riders; We delight in designing and producing practical accessories to make your ride experience better and more enjoyable
Customers say
Customers find the bike bag high quality and appreciate its storage capacity, with one mentioning it can hold 25 regular-sized water bottles. The bag is well-made, easy to attach, and features a sturdy material. While some customers consider it good value for money, others note its high price. The size receives mixed feedback, with some finding it great while others say it’s smaller than listed.
8 reviews for BiKase MIK Compatible Trunk Bike Bag Big Daddy with MIK Attachment, Waterproof Bag for Back of Bicycles with Panniers, Pannier Rack Bag with Water Bottle Carrier (MIK Rack not included)
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James –
A+ buy… so good we bought two!!!
I really like it!!! Fit my bike well. Holds a lot of stuff and doesn’t hamper getting on or off the bike. It is designed to put ice and drinks inside to ensure you have cold beverages along the way or at the end of your ride. Great product. Sturdy and nice styling. Reflective material helps out to be seen as well. Nice Zipper and reasonably priced.
Amazon Customer –
Massive Storage AND Also a Cooler
I spent over an hour searching bike rack bags that were both storage AND a cooler. I just couldn’t find any, until I found this one. That was my sole reason for buying the Big Daddy. I took it on a 20-mile test ride and biked like an idiot, braked hard, took sharp turns, took bumpy paths, and rode in the grass in order to put it through the ringer. It did fine, didn’t slip! I also first thought I’d have trouble swinging my leg over the bike when mounting, but there was no issue there. This rack is a bit expensive, but I’m happy with the quality and the capacity of this thing. I should mention that the photos of the bag inside my apartment make it look like the bag isn’t seated properly, however thats because I didn’t bother strapping down the bag fully. I only was taking shots of it fully loaded to show you all the capacity it holds. I will update this review if any future issues come up, but see below for pro’s and con’s:The Pros:- Massive storage! I STUFFED ALL POCKETS AND WAS ABLE TO FIT 25 REGULAR SIZE WATER BOTTLES AND TWO CANS OF SODA IN IT! I only did this for testing purposes but wow, much more capacity than I expected. Each side pannier held 9 bottles, the main compartment 4 bottles and one can of soda, the rear bottle holder on bottle, and I strapped 2 bottles to the top of it.- It’s also a cooler! The main compartment’s inner lining probably isn’t the strongest but it does its job. I filled it with about 30 cubes of ice and some drinks, and even after I got home I let the bag sit before I emptied it. The contents were in it from 5:30 pm to 11:00 pm, and although ice did melt, there was still ice left. Could the cooler be better? Yes, but since it’s handling both the task of keeping items cold and also as storage, I forgive it. The cooler lining also inverts and you can pop it out (pictured) to properly dry out the corners and tight spots.- Dual-side pannier storage (if you so choose to use it). The side panniers hold a pretty massive amount. As I mentioned earlier I was able to stuff 9 water bottles in each one, and honestly I could’ve thrown a bunch of smaller items in each one too before it was completely full. Even if you choose not to unfurl the panniers and just use the pockets they are stuffed in, you can fit a few items in that way too. The panniers have a strap to attach them to the rack so that they sit secure as well.- No issues with the bag slipping around on my rack- Decently sturdy material, including the material the panniers are made of.- Come with easily detachable strap for carrying around.- Zipper pocket on the underside of the main compartment’s top.The Cons:- I believe it said the main compartment is internally sealed. And when you have it zipped up, the zipper does look like an airtight seal, however when I tilted it to the side intentionally, the water from the melted ice seeped out of the zipper (pictured).- The main compartment cooler lining isn’t the greatest. I feel like one day it will rip and I’ll have to use a sealant on it. But that being said, it does it job as a cooler, it’s just not the greatest.- Side pockets don’t hold much if you plan on using them as pockets and not unfurling the side panniers.
Duane W Parchem –
Haven’t used it as of yet
Great quality. Love the way it locks into the rac. It seems great. Just received it.
Elisabeth –
Great bag option for MIK bike racks.
Nicely made trunk bag. Purchased for its MIK bike rack compatibility. Like that it’s waterproof inside. The zippered side panniers are a nice addition. I like that it also has a place for an extra water bottle.
Gregory D. Clark –
Best Bike Case for MIK bike racks
Outstanding quality and came with a fluorescent rain cover. Plenty of room in the main compartment and the saddle bags are equally accommodating. The reflective stitching is a plus and stands out on both sides and back. The case fits smoothly on the MIK storage frame and came with the corresponding key to lock it in place. It is easy to take on and off and the accompanying shoulder strap makes it easy to take with me when I need to take the case inside for shopping or carrying items to and from my bike. The case is on the higher end of the market pricing, but still good value for the money.
H. Holle –
Not durable or for bike commuters or serious riders
I’ve purchased this bike bag twice now for my husband to use for his commute. Both times it has lasted less than six months. We will not be replacing it with another. The straps that connect to the bike rack ripped, and the stitching on the seams that hold the straps to the bottom of the bag began falling apart. I definitely do not recommend this case for people who commute, ride in any kind of inclement weather condition, or will be putting anything in it that needs to be terribly secure. It is not a durable pack.
Craig Teters –
Brilliant Design. Many surprises.
Brilliant engineering and design. You MUST have an MIK (Mounting Is Key) baseplate (bike rack) to accept this case from the factory. It will easily lock and click in. It comes with a carrying shoulder strap if you want to take it off the bike and carry it — and a rain cover if needed. The top expands with a zipper release like a suitcase if you overfill it somewhat. Excellent reflective materials. It has left and right hidden expandable panniers for more storage. External bungee cord and pocket as well. Excellent design.
Systems_Consultant –
I like it.
As other reviewers have said this rack pack is a little smaller than others I own. But I find it adequate adequate for my rides where I need a place to store tools and discarded outer ware as I warm up or to store âjust in caseâ rain gear of jackets.I donât like the quick release mechanism on this as much as the proprietary ToPeak brand that I have on my other bikes. This one takes a little more fiddling to release the bag from the rack and requires a tool that must be inserted into an awkwardly located slot under the rear of the pack in the bike rack. But since my bike came with a nice MIK compatible rack I thought I should try to find a MIK compatible rack pack. But they are surprisingly hard to find given that the MIK system is marketed as an industry standard attachment method for bike rack accessories. Overall Iâm glad I found this one.