Battery pack
Being seen, and being able to call someone.
What a plan says about it
The planner writes this from the ride you describe, so there is no version of it that is true for everybody. Here it is worked against one ride, named below, with a single answer changed at a time to show what moves.
2 nights · wild camping · cold but not freezing (8 °C) · gravel and tracks · towns daily
You said a weekend, so we plan to 2 nights without mains. Your phone is your map and your way of calling someone, so it running flat is a safety problem rather than an annoyance. If your own dates run longer than the answer you picked, so does what this has to cover.
On that ride the planner marks it essential.
Change one answer
The same requirement, reasoned again from a different answer. One answer moves at a time, so what each one adds is attributable to it and to nothing else.
- Sleeping · Indoors
You are indoors most nights, so this is a buffer rather than the whole supply.
The figure to hit
- The ride above
- enough for 2 nights without mains
- Nights · One night
- enough for 1 night without mains
- Nights · A long weekend
- enough for 4 nights without mains
- Nights · A week or more
- enough for 10 nights without mains
Ways to satisfy it
These add up rather than rule each other out — carrying two is the ordinary practice here. Every one carries what it costs you as well as what it gets you.
Battery pack
Simple, and you know exactly how much you have.
but Finite. When it is empty it is weight.
A plain web search. We earn nothing from it.
Find one ↗Dynamo USB charger
Charges while you ride, for as long as you keep riding.
but Slow below about walking-pace-plus, and it costs a wheel.
A plain web search. We earn nothing from it.
Find one ↗Solar panel
Free power in the right place.
but Slow, fragile, and close to useless under cloud or trees.
A plain web search. We earn nothing from it.
Find one ↗
Where to look
We hold measured dimensions for bags and for nothing else, so this hands the requirement to a search rather than picking something for you. Nothing on this page has a price, a weight or a maker attached to it, because none of those were measured.
A plain web search. We earn nothing from it.
Search for Battery pack ↗Which one do I need?
That depends on the ride, and this page does not know it. The interview does, and it is the only thing here that can answer the question — no account, and every line it gives you names the answer that produced it.