I always carry a Tibloc on my harness, along with a couple of prussic's, knife and in winter v-threader (made out of a coat hanger!). Can use for simul-climbing by clipping to a piece of gear with a large diameter locking carabiner with the rope running through the biner. Use two if you are climbing on double ropes. This way if the second falls they fall on the piece of gear and don't pull the leader off! WARNING!!! Cannot give slack to the second with this system, so they better have their poop together!

The Petzl Tibloc is a brilliant piece of design, although it is often misunderstood or misused. Its main purpose is as an emergency, lightweight ascender for climbing up ropes, like in the case of a crevasse fall or ascending a short bulge. These are NOT intended for thousands of feet of jugging (climbing ropes) or as a replacement for a Prussic cord on your glacier kit. Due to the aggressive teeth, if you fell on a Tibloc, you could easily tear the sheath on a rope, so these are for ascending only. They are perfect for times when you think you might need to ascend a rope (crevasse fall, tough climb that you might not make it up, canyoneering), but don't want to carry a full-on ascender.

Great way to rig up a crevasse rescue setup.

i really love this! it's super lightweight and works great. i got two so there's one for my foot and one for my harness. for the foot tibloc, i made a loop of 8mm cord to stand in. i took the advice of one reviewer and got two petzl attache locking biners to use with them. the attache fits through perfectly and the teeth in the tibloc bite down nice and solid. i've never had to use them in an emergency, but i've strung a rope up in a tree several times to practice using them and getting hooked into them mid rappel and have been very pleased with the ease of use and simplicity of design. like others have said, be sure to put a small cord through each one so that you don't accidentally drop it.

I love my tiblocs. I generally prefer not to carry extra equipment on me, so after trying various ascenders (for canyoneering, so I'm not doing huge ascents), my preference was various cord ascenders (bachman/prusik/valdotain/french braid)... until I encountered a particularly difficult 200 ft ascent, and now I'm 100% happy using the tiblocs. They go over edges very nicely and add no weight to your harness. Caveat - use a small accessory cord so you don't drop the tibloc, since you have to take it off your biner to clip it to the rope. AND, make sure the biner is set in place before you weight the tibloc EACH TIME you move it - or you'll have a messed up hairy rope!

When vertical caving, I always have two of these clipped to my harness in the event my Basic or Croll decide to call it a day. It's a minimal, lightweight, emergency device that will get you up the rope safely without the hassle of fooling with knots. As mentioned below, this isn't meant to be a primary ascender under any circumstances. Would you use an emergency "space blanket" as your sleeping bag? I still have Prusik loops on hand -- you can never be too safe -- but the Tibloc is my first line of defense.

Good for emergencies... Much better then just prussics, much faster to put on and ascend. Not much heavier, much more compact then loops.

Be clear, this is an emergency ascender. It is as slimmed down as possible. It is not fun to use, but when needed it will save your butt. I carry these almost all the time, they can help a second ascent or even be used to build hauling rigs and rescues. For their weight and size they are amazing.

What a waste of space! I carried one for years as an emergency backup, and when the emergency came, it was a total dog! (I needed to climb >3,000 feet of rope to exit a cave) In the end, I patched my broken ascender with a bit of shoelace (totally sketchy) rather than use the darned tibloc. Its best use by far is to open beer bottles.

I used to carry my DB Ascenders with me while canyoneering because they are easier and quicker to climb a rope with, but I didn't need to use them very often and they are heavy. I bought these tibs to replace my DB ascenders when canyoneering and they have been great! they are super light and small and they do the job well if you know how to use them (read the instructions and practice at home first). I have used them to climb a 9mm static rope once and used them multiple times to help grip the 6mm pull cord to pull a rope down from a rappel. I use the BD Rocklock carabiners and they work will with these tibs. My only complaint is I think the price is higher than it should be for these little aluminum ascenders, but they are worth it if your canyoneering and want to save some weight. be sure to by 2 because they are only sold as 1.

easier than a prusik but not as cheap, prusik is nicer on the rope as well I will stick with the extra cord on the harness.

The ascenders are simple, easy to use,and glide and hold like a charm. They are lightweight and simple which makes them perfect for long climbs, or canyons. The instructions are simple and easy to understand if you are a first time user.

If you are doing a lot of ascending get a real ascended. Use it as an emergency back up. Make sure to run a bit of string and attach it to you or you're going to lose it when trying to set it up; especially with cold hands. If you have the money get a couple.