https://www.mec.ca/en/product/5041-741/iPhone-6-Plus-Case https://www.mec.ca/en/product/5050-243/Waterproof-E-Case https://www.mec.ca/en/product/5044-390/Smartphone-Bags---2-pack soz all Canadian sources
Had a rapha branded locksack, worked well for 4 rides until the the plastic split :( will look into the others though, thanks.
Have a look at Outdoor Research, E Case, Aquapac and Exped all make decent waterproof soft cases in many sizes with a variety of closure systems.
Edit: I now see a couple of those have already been mentioned
Got a Decathlon nearby?
I have a 'hapo:G', the largest for 5.5 inch phones, for my LG G4. Roll-top with Velcro rather than zip. Does have a clip on the back to fix into the stem mounting bracket though.
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https://www.mec.ca/en/product/5041-741/iPhone-6-Plus-Case
https://www.mec.ca/en/product/5050-243/Waterproof-E-Case
https://www.mec.ca/en/product/5044-390/Smartphone-Bags---2-pack
soz all Canadian sources