(2 Bottles) Small, Semi-Rigid, Easy-to-Clean, Refillable Gu Flask for Sports Nutrition Liquid Energy Gel Flask - Cycling Flask, Running Flask, Triathlons, Marathons. 110ml (3.5oz)

My go-to energy source! This is compact, convenient, durable yet easy to squeeze that has been flawless. The flow for my maple syrup is smooth, getting that quick energy I need in just a quick easy squeeze. The top pops into place securing it as I have not had it leak on me yet. This is right up my alley as an endurance athletic that I use for mtb, gravel, road and fat-biking. I could not ask for a better product that fits my needs and wants. Super easy to clean. For the price, it has paid for itself ten times over if I were to consistently use gels, such a great investment. Well worth the purchase!

Fantastic . Perfect for airplane travel. No leaking, no smell, great quality and a great value for the money. I'm ordering others to give as gifts to friends.

I usually don't leave reviews, but these flasks are a great product. I just bought two more. I am an ultra runner and recently started making my own gels. These are very sturdy yet lightweight, great quality, and fit easily in all of my hydration packs. No leaks and easy to clean. I like the ergonomic handle so it's easy to hold when I'm running. I can tell these will last a long time.

Pays for itself after 8 gels. No more trash so it’s a good eco friendly alternative as well as economical. Little syrup and water + salt. Good to go.

I really loved this idea because I hate how energy gels are packaged. They cut the side of my mouth, they are hard to open when you are running, and they become a sticky mess no matter how careful you are. These flasks are made of a pretty hard plastic, but they are actually very easy to squeeze. I was able to put two gels in each of them, and I mixed the gels with a little bit of water. I also used them with liquid energy gels which didn't need extra water. I was surprised at how easy they are to clean and they are very light. They are easy to open and close and fit in my pocket easily. I did have one major fail with them during an actual marathon, though. I put them in a pocket where they were pretty free to move around, and the cap came unscrewed and dumped the whole bottle of chocolate gel down my leg. My mistake, but make sure the cap is screwed on tight and the nozzle is closed before you go running.

.. or same consistency. I originally tried using Gu branded gel flasks, but the twist top was not so useful when cycling (I use these for endurance MTB & gravel cycling events). Holding the flask with one hand and trying to twist open it with my teeth while pedaling, the entire cap would start to twist off making an awful mess of gel/syrup all over my hand and the bike.These flasks are much more convenient. The pull-top opening is much easier and trouble-free; just a quick pull to pop it open and give a quick squeeze and you're good to go. Then snap it closed with your thumb (or pop it against your helmet) and it's sealed and ready to stow away, leak free.Your only other consideration is what you use for energy gel. I probably wouldn't use these for GU gel, honey or anything with a similar (thicker) viscosity. I'm not sure how well those would flow through the cap opening. Personally I use organic maple syrup for my energy gel and it's the perfect consistency; no matter the temperature it's thin enough to flow.

I found the tops a little challenging to open while running. They were too tight. As a backup bottle for some nutrition or hydration, they work, but I found the Hammer Gel flasks worked better for me.

Holds honey or sweetened condensed milk with no leaking. Pop top is secure, I don’t use my teeth to open, just my fingers as it takes some force. I use them while cycling, much easier to use than the small GU packs. Fit easily in rear jersey pockets. Clean up is easy. Buying another set as I’m going to try to complete a century this year.