My no-brand bladder started leaking but I think it served its life well enough after 100 days of use - much longer than my $70 camelback which leaked on the first outing. Here's my rational for choosing a bladder:
When looking, there were a few features i wanted which annoyed me from previous bladders.
- I certainly didnt trust camelback anymore after my friend's camelback leaked on his 2nd outing aswell. Their opening is nice and wide but i didnt like its location.
- another cheapo bladder was on the agenda, but wasnt too keen on the opening being where it is. The cleaning process was a pain since it was too hard to dry so usually kept it in the freezer after cleaning as suggested by some on this forum.
- this requirement automatically discounted other brands due to having similar openings such as the mopack flomo and osprey.
- Ive got a really good old platypus hoser 6 years now and its easy to dry out with the small round opening on the top corner. However I wanted something with a wide opening for easy refils and its easier to dump some gatorade powder in. thats why i didnt use the old platypus often.
- a Friend used a denali bladder from annaconda which seemed ideal since it had a nice wide slide opening. My experience with Denali in general hasnt been too flash. But to be fair, his hasnt leaked yet and this was probally the highest high on my list.
- Then I came across the platypus Big zip SL that micheal_P mentioned. Osprey's bladder looks very nice but slightly overbuilt while the platypus appears nice and simple. as a result its relatively light for a 3L bladder at 163 grams. I just love it when items match, or are lighter than manufacturer's specs. cascade designs seems to be quite good with this sort of thing.
+ I fully trust platypus. They have been known to leak but i feel they are still tougher than most (except the msr ones)
+ its got the opening at the end for easy drying after being cleaned.
+ Its opening is wide, so i can fully shove my sponge in to clean it or pour powerade powder in easily.
+ its hose is disconnectable from the bladder - a cool feature i havnt seen in other brands.
Negatives
- The mouthpiece is an improvement over the older style platypus with a shut off by twisting the mouthpiece. Its more ergonomic in the mouth than most other brands. However, camelback's mouthpiece is still better in my opinion due to a higher flow rate. the platypus's flow rate is significantly lower than the camelback so if you're a big gulper when thirsty, better off replacing it for camelback's mouthpiece
- they make you buy the mouthpiece protectors separately just like other brands. but since i already had the camelback one, i'd use it instead.
- the mouthpiece is very hard to remove and put back. This is annoying when cleaning the hose, whereas the camelback's mouthpiece is easily removable and replaced to clean out the hose.
-unlike the older style platypus bladders, these dont stand up on their own.

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General comments
the slide lock is slightly different than dueter's/Denali's because its just like your normal zip lock bag where you zip it up then slide the plastic piece over to hold it in place. With the denali bladder, you have to fold it over to make a crease, then the plastic that slides over it holds that crease. the denali design appears to be better, but i time will tell if the playtpus slide works just as good.
- so i would Highly recommend the platypus zip SL and replace it with a camelback mouthpiece + cap.