The steel screw cap with loop works great with the 40oz bottle. I was a bit confused trying to be sure that I was getting the right sized bottle and style of cap, but going directly to seller's webpage (Dr Holistic Market) made that much easier. 5 stars

I reviewed the bottle that this cap is used on earlier so i wont bore you with that again. The stainless steel bottle comes with a fancy "sports cap" that leaks as soon as the bottle is filled. To avoid this this cap is needed and, in fact, should come with the bottle standard! This is really a rip off. 4 stars

I swear to God I ordered the sport top. I got the loop instead. Emailed the seller, no reply. 1 star

I use the cap on the 1-liter bottle. I found the bottle and cap to be good quality, easy to clean, and fits into cupholders. I use the optional cap instead of the provided suck-nipple. The cap is a bit of a pain because of overflows after filling. The solution has been to leave a fair amount of air at the top when filling. This is not a problem with the nipple since it is hollow. 3 stars

When I ordered my stainless steel Enviro water bottle, it came with a sports cap that was plastic and basically 'crappy!.' I was disappointed with the quality of the cap, but had seen this blue replacement cap on a friends bottle and knew this was a much better option.

Pros: Cap seals tight and the loop top allows me to attach a clip so that I can take it with me hands free if necessary.

Cons: Because the threaded neck seals down into the bottle, you cannot fill it all the way to the top. If you do, when you screw the cap down into the neck, the cap will push the excess water out of the bottle. This isn't a huge inconvenience, but if you're purchasing a smaller water bottle, filling it less than full may not give you as much water as you bottle truly holds.

Overall, I'm happy with the quality and the cap is very easy to keep clean. 5 stars