Rain Jackets, Pack Covers, and Dry Bags: What Actually Needs Protection

Rain has a way of finding the weak point in an otherwise sensible packing system. A pack cover may keep the outside of your backpack looking dry, while a wet back panel, uncovered harness, or water entering around the opening slowly soaks what matters inside.

The useful question is not, “How do I waterproof everything?” It is, “What must stay dry for safety, comfort, and the next stage of the trip?” Once you sort gear by consequence, you can protect essentials without turning every item into a plastic-wrapped puzzle.

For most hikers, paddlers, and car campers, the reliable approach is layered: wear rain protection, use a pack cover where it helps, and put genuinely critical items in waterproof bags or a waterproof pack liner.

Start with the consequences of wet gear

Not all wet gear creates the same problem. Some items can get wet and still work. Others become uncomfortable, unsafe, or useless.

Items that should stay dry

Protect these first, ideally inside a pack liner or dedicated dry bags:

Sleeping bag or quilt: Wet insulation loses much of its warmth and can be difficult to dry in damp weather.
Sleep clothes and spare insulating layers: A dry base layer, warm socks, and insulating layer can make a cold, wet evening manageable.
Emergency insulation: This might include a puffy jacket, fleece, gloves, toque, or an emergency bivy, depending on your trip.
Navigation, communication, and power: Maps, phone, satellite communicator, headlamp, spare batteries, and power bank all deserve protection. A paper map needs its own waterproof map case or sealed bag.
First-aid supplies and medication: Keep these accessible, but protected from soaking.
Matches, lighter, and fire-starting supplies: A lighter is often more dependable than matches in wet conditions, but both should be kept dry.
Food that is damaged by water: Items in cardboard, paper packaging, or unsealed bags can quickly become messy or unusable.

For overnight backcountry trips, your sleeping system and dry change of clothes are usually the highest priorities. If they remain dry, a wet hike can still end in a warm, workable camp.

Items that can be wet

Many durable outdoor items are made to tolerate water. It is usually fine if these get wet, provided you manage them so they do not soak the important gear:

tent fly, tent poles, stakes, and groundsheet
water bottles and hydration reservoirs
cooking pot, stove fuel canister, and utensils
sandals or water shoes
trekking poles
rain pants and rain jacket exterior
rope, throw bag, and many paddling items

“Can get wet” does not mean “has no downside.” A wet tent adds weight, a soaked camp chair is unpleasant, and wet footwear may be slow to dry. But these are generally comfort or convenience issues rather than problems that compromise your ability to stay warm overnight.

Your rain jacket protects you, not your pack

A rain jacket is your first line of defence while moving. It should keep rain off your torso, reduce wind chill, and help preserve the dry layers underneath. It is not a substitute for protecting the gear in your pack.

Even an excellent waterproof-breathable jacket has limits. In prolonged rain, sweat, condensation, wet cuffs, and water running in around the neck can leave inner layers damp. If you are working hard uphill or paddling, ventilation often matters as much as the waterproof membrane.

Use your jacket with a few practical habits:

Wear a brimmed cap or hat under the hood to keep rain off your face and improve visibility.
Adjust the hood so it turns with your head rather than blocking peripheral vision.
Open pit zips, front vents, or pockets used as vents before you overheat.
Close cuffs and hem in driving rain, especially when brush or paddle drips are forcing water onto your sleeves.
Keep a warm insulating layer inside your pack until you stop moving. Hiking in your only dry puffy jacket is an easy way to turn a chilly rest break into a problem.

A jacket that wets out on the outside is not automatically leaking. “Wetting out” means the face fabric is holding water and no longer beading it effectively. The membrane may still resist liquid water, but breathability often drops and the jacket can feel clammy inside. Cleaning and reapplying a compatible durable water repellent treatment can improve performance, following the manufacturer’s instructions.

What pack covers do well

A pack cover is a fitted, usually elasticized shell that goes over the outside of a backpack. It can be useful for:

shedding rain from the main body of the pack
keeping dirt, spray, and light rain off exterior fabric
reducing water entering through zippers and outer pockets
making it easier to set a pack down on wet ground
providing a bit of high-visibility colour in gloomy conditions

For day hikes in intermittent rain, a pack cover can be a simple and worthwhile piece of gear. It is also helpful when your pack is not fully loaded and has exposed seams, zippers, or mesh pockets that readily collect water.

For car camping, a cover can protect a daypack left outside the tent vestibule or carried between the vehicle and campsite. It is not a reason to leave electronics, bedding, or other moisture-sensitive equipment outside overnight.

Where pack covers fall short

A cover protects only part of the pack. The shoulder straps, hip belt, back panel, and the gap around the harness remain exposed. In sustained rain, water can run down those areas and wick into the pack fabric. Water may also enter from the top if the cover shifts, or from below when you set the pack on wet ground.

Wind is another weakness. Covers can billow, slide off, or become a nuisance in brush. A loose cover may snag on branches. On a paddling trip, a pack cover is especially limited: spray, a wet canoe bottom, and a capsize can soak a covered pack from directions the cover was never designed to handle.

A pack cover also does not make a backpack buoyant or waterproof. Do not assume it will protect critical gear during a swim, a ferry crossing, or a wet portage.

The practical conclusion is simple: use a pack cover as an outer shield, not as your only waterproofing plan.

The pack liner is the dependable foundation

For most backpacking trips, a waterproof pack liner is the simplest way to protect the contents of your pack. It is a large waterproof bag placed inside the main compartment before you load gear. Heavy-duty pack liners and purpose-built waterproof liner bags are more durable than thin household garbage bags, though a sturdy contractor bag can be an economical option for shorter trips.

Pack your liner in this order:

Put the liner inside the empty pack.
Load your sleeping bag, sleep clothes, insulation, and other items that must remain dry.
Compress the air gently rather than forcing it out aggressively.
Twist or fold the top closed, then secure it according to the liner’s design.
Put wet, durable, or frequently used items outside the liner when practical.

A liner protects everything inside one barrier, including gear that might be missed if you rely on several small bags. It also avoids the false confidence of an outer cover alone.

The tradeoff is access. If you need your lunch, first-aid kit, or rain mitts during the day, do not bury them at the bottom of a tightly closed liner. Keep frequently needed items in a small dry bag near the top, a waterproof pocket, or an easily reached outer pocket if the item can tolerate some moisture.

Use dry bags for organisation and higher-risk items

Dry bags are most useful when they do two jobs at once: waterproofing and organisation. Rather than putting every item in its own bag, group gear by purpose.

A practical overnight setup might include:

one larger dry bag for sleeping bag and sleep clothes
one medium bag for insulation and spare socks
one small bag for first aid, electronics, batteries, and fire-starting supplies
a separate bag or case for map and documents

For paddling, dry bags become more important because immersion is a realistic possibility. Use bags with a proper roll-top closure, fold the top several times as directed by the manufacturer, and secure the buckles. Do not overfill them: a crowded dry bag is harder to seal correctly and more likely to leak at the closure.

Waterproof bags vary widely. Some are intended for brief splashes and rain; others are designed for extended immersion. A roll-top bag that has been dragged over rocks, left open by one fold, or punctured by a stove pot will not perform as intended. Inspect bags for wear and test any critical bag at home before relying on it.

For electronics, a dry bag is useful but not always enough for full protection. A small waterproof hard case, padded pouch inside a dry bag, or a phone case designed for submersion may be more appropriate, depending on the activity. Keep in mind that a sealed phone can still be hard to operate when wet, and a case can interfere with charging or sound quality.

Keep wet gear from soaking dry gear at camp

The packing system matters just as much after you stop moving. A soaked rain jacket, wet tent fly, and muddy groundsheet can transfer a surprising amount of moisture in a small tent.

When you arrive at camp, separate gear into wet and dry zones:

Keep sleeping gear and dry clothing inside the tent, ideally still in their bags until needed.
Store rain gear, wet shoes, and the tent fly in the vestibule or under a tarp where site conditions allow.
Put a small groundsheet, plastic tote, or durable bag in the vehicle for muddy footwear and wet clothing when car camping.
Turn rain jackets and pockets inside out when possible, and hang them where air can circulate. Avoid draping wet gear directly over a heat source or too close to a campfire.
Use a dedicated stuff sack or plastic bag for a wet tent during travel, rather than pressing it against your sleeping bag or clean clothes.

If you have to pack a wet tent in the morning, keep it separate and set it up to dry as soon as you reach home or your next dry stop. Long storage while damp can lead to mildew, odour, and damage to coatings.

Match the system to the trip

You do not need the same waterproofing system for every outing.

Day hike

A rain jacket, pack cover, and a small dry bag for phone, emergency layer, and first aid are often enough. If the forecast suggests persistent rain, add a pack liner or at least put your spare insulation in a waterproof bag.

Overnight backpacking trip

Use a pack liner for the whole main compartment, plus dry bags for sleeping gear and critical small items. A pack cover is optional but helpful as an outer layer in rain and mud.

Canoe, kayak, or SUP trip

Prioritize properly closed dry bags and secure them to the boat as appropriate for the craft and conditions. Treat the pack cover as optional protection from rain, not immersion protection. Keep navigation, communication, and emergency gear in accessible waterproof storage.

Car camping

Waterproofing is less about carrying weight and more about campsite order. Protect bedding, spare clothing, electronics, and food packaging from rain and condensation. Plastic bins, a tarp-covered cooking area, and a place for wet footwear can be more useful than multiple expensive dry bags.

Build a system you can use in the rain

The best waterproofing setup is one you can pack quickly with cold hands and use without unpacking half your bag. Keep your rain jacket accessible. Store essential warmth and sleeping gear behind a dependable waterproof barrier. Use dry bags to organize the items that would be most troublesome to lose to water. Add a pack cover when the conditions and activity make it worthwhile, but do not ask it to do more than it can.

Before your next wet-weather trip, lay out your gear and make three piles: must stay dry, useful if dry, and fine when wet. Then pack from the inside out, with the highest-consequence items deepest behind the most reliable protection. That small bit of planning makes rainy camps noticeably more comfortable.