Acepac Triangle Frame Bag MKIII

Acepac is a Czech manufacturer of bikepacking gear and today we’ll look at their representative in the frame bag category. I tested the Triangle Frame Bag MKIII, which holds up to 2 litres of gear. It weighs 130 grams including the supplied straps.

It’s sewn from Robic Nylon, which is light and durable, but only offers basic water resistance. So after heavier rain your stuff inside will not stay dry. The frame bag has on one side a two-way, water‑repellent YKK zipper. Inside you’ll find two mesh pockets.

🧑‍⚖️ Evaluation

It’s the smallest of the frame bags Acepac offers, so if you have a smaller frame size or MTB geometry there’s a decent chance it will fit your bike. I use it on a Supercaliber in size M/L and it fits just about right.

Along the entire top and bottom edges it has loops for hook‑and‑loop straps with which you can secure the bag to the frame. I would appreciate a loop at the rear as well (technically rear/front, since the bag is reversible) to secure it even better. Nevertheless, the zipper is still operable one‑handed without it. You get 5 long Velcro straps with the bag which you trim with scissors as needed.

The mesh pockets inside are nice for organising items, but if the bag is fully packed they’re harder to access. If the bag had a zipper on both sides, the small bits would be more reachable. On the other hand they might be a good semi‑hidden spot for documents.

What I miss is a port for a hydration bladder hose. I tried putting a two‑litre bladder inside; it fit, but the hose had to be kinked and I’d worry about its durability.

📐 Summary

The frame triangle is the ideal place to stash especially heavy items. The Acepac Triangle Frame Bag is light—even compared to a similar bag from Apidura—and it’s also about 2.5× cheaper. If you don’t need waterproofness and will, for example, carry food in there, it’s a good candidate. The weight-to-volume ratio is very favourable. The price comes in under one thousand CZK.

I miss a front/rear Velcro loop, but even without it I can operate the zipper one‑handed along the full length. A second zipper would allow better item organisation. I received the bag as a prize for second place at Slovakia Divide, so I didn’t worry about frame compatibility. Many manufacturers offer a printable template, but I didn’t find anything like that from Acepac.