Pick a backpack that fits your torso, carries your heaviest load, and matches trip length, with room for food and water.
A backpacking pack isn’t just a big bag. It’s a load carrier. When the fit is right, you stop thinking about it and start thinking about the trail. When the fit is wrong, you feel it in your shoulders, your hips, and your mood.
This guide breaks the choice into a few checks you can do in a store or at home: volume, load range, and fit. You’ll finish with a short shopping filter you can use on any brand.
Backpacking Pack Size By Trip Length
Start with capacity. Pack volume is listed in liters (L). A smaller pack forces tighter packing. A larger pack gives breathing room, yet it can tempt you to toss in extra stuff. Use the table as a starting point, then adjust based on how bulky your shelter and sleep gear are.
| Trip Style | Typical Capacity | What Usually Drives The Size |
|---|---|---|
| Overnight, mild weather | 40–50 L | Compact sleep kit, simple meals, one spare layer |
| 2–3 nights | 50–60 L | More food volume, rain gear, less cramming |
| 4–6 nights | 60–70 L | Bulkier sleep gear, extra fuel, room for shared items |
| Week or more | 65–75 L | High food carry, refill gaps, repair and hygiene items |
| Ultralight kit | 35–50 L | Small shelter, quilt, minimal clothing, careful packing |
| Cold trips | 65–85 L | Insulation, bigger shelter, extra fuel, gloves and hats |
| Bear-canister areas | 55–75 L | Canister size and shape, plus food for permit days |
| Fast weekends | 40–55 L | Light layers, tight meal plan, slimmer carry style |
Backpack For Backpacking Fit First
If you’re asking “what backpack should i use for backpacking?”, fit is your first filter. A pack can be the right liters and still feel rough if the torso length or hipbelt doesn’t match your body. The hipbelt should sit on the bony shelf at the top of your hips, then carry most of the load.
Measure Torso Length Before You Shop
Torso length isn’t your height. It’s the distance from the bony bump at the base of your neck to the level of your hip bones. This measurement tells you which pack size range to try first. REI’s fit and torso size guide shows the measurement points and the strap order.
Check Hipbelt Shape, Not Just Belt Length
Hipbelts come in different shapes. Some wrap better on straighter hips. Others hug more curve. Load the pack and walk around. If the belt creeps down, bites your hip bones, or leaves gaps, try another model.
Pick A Harness Style You Can Dial In
Fixed-size packs (S/M/L) can feel clean and stable. Adjustable harness packs give you wiggle room if you’re between sizes or share the pack. Either works if the shoulder strap anchors land about 1–2 inches below the top of your shoulders once the hipbelt is set.
Match The Frame To Your Heaviest Day
Frame choice decides whether your pack stays composed under food and water. Most backpacking packs use internal frames: aluminum stays, a frame sheet, or a perimeter wire. They carry weight close to your back and transfer load to your hips when the hipbelt is snug.
Frameless packs can feel free with light kits. They rely on your packing to create structure, often using a folded foam pad. If your loaded weight climbs into the mid-30s or above, a sturdier frame and a firm hipbelt usually feel better for most hikers.
Choose Capacity Around Your Bulkiest Gear
Trip length matters, yet the “big three” matters more: shelter, sleep system, and the pack itself. A compact quilt and a small shelter let you downsize. A thick sleeping bag, a roomy tent, or a bear canister pushes you up a size.
Try a simple home test before you buy. Put your full kit in a box, measure length × width × height in centimeters, then divide by 1,000 to get liters. It won’t match a pack spec line-for-line, yet it puts you in the right aisle.
Plan For Food And Water Volume
Food can take more space than you expect on longer trips. Dehydrated meals and dense snacks pack small. Fresh food, big cook kits, and bulky packaging eat liters fast. Water carries add weight, and that weight can push a light pack past its comfort range.
Features That Earn Their Keep
Once fit and frame are right, features decide daily convenience. A few details make the pack easy to live with. The rest is clutter.
Easy Water Access
Side pockets matter more than most people think. Try grabbing and re-stowing a bottle while wearing the pack. If you can’t do it, you’ll stop more, or you’ll end up relying on a bladder even if you don’t like one.
Pockets Where Your Hands Are
Hipbelt pockets keep snacks, lip balm, or a phone in reach. A front shove-it pocket is handy for a wet rain jacket or microspikes. Test zippers with one hand. If they snag in a store, they’ll annoy you on trail.
Top Lid Vs Roll-Top
Top lids give quick access and a little overflow space. Roll-tops seal well in rain and keep the pack simple. Pick the style that matches how you pack. If you carry a bear canister on top, strong top straps help either way.
Compression That Pulls In, Not Across
Good compression straps pull the load inward and stop slosh. They should cinch without blocking bottle pockets. If straps crisscross your side pockets, water stops turn into a hassle.
Fit Notes For Different Body Shapes
Pack labels like “men’s” and “women’s” can point you in the right direction, yet they’re not strict rules. Many women’s models have a shorter torso range, a more curved shoulder strap, and a hipbelt shaped to sit higher. If your shoulders are narrow, check that the straps don’t rub your neck when the sternum strap is relaxed.
If you need more room at the hips, look for extended hipbelt sizing or packs with swap-in belts. If you have a long torso, focus on packs with a longer harness range, not just bigger liters. When you find a pack that lets the hipbelt carry the weight without pinching, you’ve found your fit lane.
Buying Used Or Online Without Regret
Used packs can save cash if the foam still feels springy and the hipbelt isn’t cracked. Check stitching where shoulder straps meet the body, run every zipper, and inspect the bottom panel for worn spots. When buying online, keep tags on and do a loaded walk at home right away so returns stay easy.
What Backpack Should I Use For Backpacking? Quick Store Test
Don’t judge a pack empty. Load it close to your real trip weight. Many shops have sandbags. If not, bring your gear and add water. Then do stairs, a few lunges, and a short walk.
Ten-Minute Fit Checklist
- Hipbelt centered on hip bones, snug, no sliding after a few minutes
- Shoulder straps wrap without gaps and don’t pinch the neck
- Load lifters angle upward and reduce shoulder pressure
- Sternum strap sits across the chest without choking or pulling too tight
- No hot spots on hips, collarbones, or lower back
If you want a brand-side sizing walkthrough, Osprey’s size and fit page explains torso sizing and hipbelt fit with photos.
Pack Smart So The Load Rides Quietly
A good pack still needs good packing. Put dense items close to your spine and near mid-back height. Keep light, bulky items lower. Store rain gear where you can reach it fast. This keeps the load from swinging and makes steep steps feel steadier.
At home, do a short loaded walk and tweak in small steps. Set the hipbelt first. Then snug shoulder straps. Then lightly snug load lifters. Then set the sternum strap. If your shoulders feel crushed, loosen the shoulder straps a touch and tighten the hipbelt a touch.
Backpacking Backpack Features Checklist
Use this table when you’re comparing two packs that already fit. It helps you decide which one matches your trips and your habits.
| Feature | Why It Helps | What To Check |
|---|---|---|
| Adjustable torso | Fine-tunes fit if you’re between sizes | Slide harness, re-tighten, then see if shoulder anchors line up |
| Firm hipbelt | Moves weight to hips and eases shoulders | Load pack, tighten belt, then feel where the weight sits |
| Front shove-it pocket | Fast stow for wet layers | Stuff a jacket in and shake the pack a bit |
| Side pockets you can reach | Water access without stopping | Grab and re-stow a bottle while wearing the pack |
| Hipbelt pockets | Snacks and small items in reach | Test zipper pull and space with your phone |
| Top strap or y-strap | Secures bulky items like a bear can | Check strap length and buckle strength |
| Simple compression | Stops slosh and keeps balance | Cinch it down and see if it blocks pockets |
| Durable fabric in high-wear zones | Resists scrapes on rock and brush | Feel panel thickness on the bottom and sides |
A Fast Buying Filter You Can Reuse
When you circle back to “what backpack should i use for backpacking?”, run this filter. First, confirm torso size and hipbelt comfort. Next, choose a volume lane from the first table. Then match the pack’s load range to your heaviest day. If a pack fits all three, it’s worth a longer test walk.
Try at least two brands if you can. Strap shapes and hipbelt curves vary, and that tiny difference can decide comfort. Once you find a pack that rides calmly, you’re done.