Stem bag with lid
If you’re not planning on carrying bottles in your stem this version offers a bit more protection to its contents, it’s particularly well-suited for a compact camera but anything goes. I consider these an invaluable bikepacking bag as they offer great on-the-bike access and quite a lot of volume. On my own bike I have one for a 750ml bottle on one side and a lidded version with food and essentials like sun cream on the other side.
These come with Voile straps for mounting them to the bar and two extra straps (one around the stem and one around the fork leg) for ultimate stability.
At 8x8x15cm these are a smidge under 1 liter, the 9x9x17cm is just under 1.5 liter.