Is a 100L Backpack Sufficient for Winter Camping with a Large Sleeping Bag?

I’ve been using a 60L backpack for hiking during the warmer months, but I recently acquired a large winter sleeping bag that takes up about 70% of that space. Would an 80L pack suffice, or should I opt for a 100L backpack? I’m open to budget-friendly suggestions.

It’s best to gather all your gear first and see how much space it requires. Try packing everything into a box to gauge the size of the backpack you’ll need.

Bao said:
It’s best to gather all your gear first and see how much space it requires. Try packing everything into a box to gauge the size of the backpack you’ll need.

Great advice, thanks! I’ll try the box method to determine the exact size needed.

Consider the climate and temperatures you’ll face. Start by assembling all your gear, then choose a backpack that fits everything comfortably. A too-large pack can be cumbersome if not filled properly, affecting weight distribution.

@Brady
I’m gearing up for temperatures around -15 to -20°C. The sleeping bag’s bulk was unexpected, hence the need for a larger pack. I’ve tried packing it both with and without a compression sack, and it still takes up too much space. Thanks for the suggestion!

@Ash
You might consider a slightly larger pack around 75L before jumping to 100L, unless you’re also carrying additional mountaineering gear. Also, consider externally attaching the sleeping bag if it’s waterproof or in a dry sack.

I frequently winter camp with just a 40L bag. You may want to reconsider your sleeping bag choice or check out lighter options that don’t compromise warmth.

The days of bulky sleeping bags are over. Look into modern ultralight options like those used by polar explorers, which offer better warmth-to-weight ratios and can fit in smaller packs.