Retractable preferred to stick: no loosing the caps!
585787
I tend to prefer these to the stick pen, as I have not a single cap left (all lost) on my stick pens. So the retractable works as an all-in-one unit to protect the tip. Love these pens. Between fine and bold point, I slightly prefer the bold. Both fine and bold write smoothly with few-to-no skips.
3567246
The cap sometimes is slick and hard to get off, which could be a good thing so you don't lose it by it accidentally falling off.
4622360
This is the one to get!!  Can hold up to 36 but 24 is more realistic.  Holds caps securely and you can actually see them easily.
3286291
Retractable Sharpies have become indispensable in my home and office.  They write on anything -- CDs, plastic bags, foil, binders, you name it -- and of course paper. The multi-colored pack offers a great selection for color-coding notes or possessions. And if you've got kids in the house, the retractable feature ensures that you'll have no more dried out markers because someone lost or forgot to put on the cap. Love this product!
2547365
I only use small amounts of construction adhesive in my work, and it's so wasteful to lose an entire tube when it dries out in between uses.  These caps fit snugly and keep the glue ready to use again, even weeks later.
I'm so glad to find them online, because I'm tired of asking for caulk gun condoms at my local hardware stores. Nobody takes me seriously.
395918
The cap keepers make a great job avoiding me to lose my lens cap. Free shipping included in the price, I would recommend this product to a friend.
3680440
These are very useful markers in a nice variety of colors and the retractable feature make them very easy to use one handed when labeling folders or holding a poster board with the other hand.  They last a long time and don't dry-out from having the cap left off or lost.  Very highly recommend!
3439654
So much more convenient to measure with the self-lock mechanism.  You needn't worry about the tape slipping back before you get a chance to lock it down.  After trying this a few times I'm sold to the self-lock didea and am never looking back to the traditional sliding switch-lock again.  The convenience is astounding!  The retracting mechanism is super smooth as expected.  I love this tape measure and so will you.  Highly recommended!
1101822
Absolutely love not having to fight my travel bottle to get the contents out...the squeezability of these guys worked great and made for less waste and more space efficiency. I risked the possibility of them leaking and exploding by putting these bottles into a soft travel pouch and tossing it into the main body of my suitcase to float around due to being in a rush, however, to my surprise they were intact upon arrival. They come with 4 small label stickers or you can use a marker on the cap to designate contents. I didn't get the chance to try the suction cups on the shower walls as the place I stayed with had a shampoo tray to sit them on. I haven't had much luck with any suction cup feature for showers though - most will end up falling in the middle of the night or sooner, so whether they work or not, I don't have much grievance over it either way. Will be using these on future trips for sure.
2605776
These stickers work well and actually are fully erasable and don't loose adhesion after repositioning.

I use these to label square glass bottles and I take care to position the label evenly to prevent the ends from coming unglued. I wish these were sold in sets of one label shape. These two minor points are my only recommendations.

I also use these in my lab. I use the chalk pen in combination with the labels to keep high-contrast notes on solution concentration.
682317
While I don't really like the small tip on these, the way they close up makes them infinitely better than the cap type where you lose them, or they get dried out. I plan on buying more of these if I ever run out. They are pretty accurate for a sharpie as well.
2433188
Searched high and low for dry erase markers that have retractable heads (not tip covers which I always lose) and that have clips (so I can clip them to my lanyard I wear around my neck. Otherwise, I leave them in the classroom. So these are perfect and worth the money!!!
4700015
These  worked very well for a project I had.
Being retractible is nice as no cap to loose.
Nice variety of colors.
4777002
cheap with sticky holders that lose their stickiness too easily
790575
If your stick's rubber coating has eroded away exposing the smaller hard plastic surface, this is an easy way to make it comfortable again. It's a loose fit and easily pops off, but the pressure of using the stick is enough to keep it firmly in place during use. Not sure if the rubber coating deteriorating is a common issue or if it's just my old third party controller, but thought I would mention it.

On a normal stick in good condition it fits perfectly. Definitely recommend.
2626564
The design makes this cap easier to get on/off than standard -- as it holds its shape.  It's a little tight however.
3490165
This is a useful product. I almost lost my pen cap in class one day, and this cap holder keeps the cap safely attached to the pen. The point that goes on the writing part is ok, but if you put it on the cap, you have to be careful to not push it down too far or it will move the cap holder too far down, thus defeating the purpose of the cap holder. That's just something to be aware of. The holder for the cord pen charger is a good idea too, as it could easily get lost otherwise as well. Useful product, and I'm glad I bought it.