This review is based on publicly available information from BiKASE’s official product page for the Big Daddy 2 Rack Bag. We have not personally tested this bag — our goal is to organize the manufacturer’s listed materials, dimensions, and pricing clearly so you can judge whether it fits your bike or e-bike setup before buying.
BiKASE is a cycling-accessory brand focused on racks, baskets, bags, drink holders, phone mounts, and e-bike essentials. The Big Daddy 2 sits in the brand’s rack bag lineup, positioned as a large-capacity option aimed at commuting, touring, and daily cargo hauling rather than minimalist day rides.
The Big Daddy 2 is a large main-compartment rack bag built with an RF seam-sealed internal liner, which the listing describes as making the interior waterproof, combined with a waterproof zipper on the main storage compartment. On top of that main compartment, drop-down panniers unfold on each side for additional cargo space when needed, and the top of the bag itself expands for extra volume.
According to the listing, the bag holds roughly 1,400 cubic inches including the panniers. Outside dimensions with panniers extended are listed at 13 inches by 9 inches by 8 inches, while the inside dimensions of the main compartment are 13 inches by 5.5 inches by 7 inches. The bag itself weighs about 2 lbs and is sold in black.
The bag attaches using four straps and is designed to fit standard rear bicycle racks up to 7.5 inches wide, which the listing notes covers most standard racks. Additional details include a built-in water bottle or drink holder sized for multiple bottle diameters, a bungee net on top for strapping down extra gear, reflective accents for visibility, and an included shoulder strap so the bag can convert to a carry-off-bike option once you’ve dismounted.
At the time of writing, the Big Daddy 2 Rack Bag is listed at $129.99. The listing (SKU 2035, UPC 859402006352) shows it as in stock with high available quantity, suggesting this isn’t a limited or seasonal item.
Potential advantages: genuinely large 1,400 cubic inch capacity when panniers and top expansion are used, a seam-sealed waterproof liner and waterproof main zipper for wet-weather commuting, a built-in bottle holder and bungee net for extra small-item storage, and an included shoulder strap for off-bike carrying.
Things to weigh: at 2 lbs and with a bulky expanded footprint, this is a large-capacity bag rather than a lightweight minimalist option, and it’s only offered in one color (black) at this size, so buyers wanting a color match to their frame or panniers won’t have options here.
Based on the listed specs, the Big Daddy 2 suits commuters, e-bike riders, and light-touring cyclists who need serious rear-rack cargo capacity for groceries, work gear, or overnight essentials, rather than riders who just want a small saddle bag for tools and a spare tube.
On paper, the Big Daddy 2 looks like a genuinely functional cargo solution: a sealed waterproof liner, real expandable capacity via the drop-down panniers, and mounting hardware built to fit most standard racks. It’s not a lightweight accessory, but for riders who actually need to haul cargo on a rear rack, especially in unpredictable weather, the feature set lines up with that use case.
Check current pricing, stock, and mounting compatibility directly on the official product page: View the BiKASE Big Daddy 2 Rack Bag.
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