Extremely waterproof rating — withstands heavy rain and water crossings.

Squeeze air out without letting water in — smaller, more stable load on the bike.

High-density fabric with ripstop + double-stitched for rugged bike-trail durability.

High-friction Hypalon back panel + wear patches grip fork legs + downtubes.

15mm buckles easily replaced in the field for long-term reliability.

The Evac uses 420D HD nylon with 10,000mm waterhead — exceptional waterproofing: What "10,000mm waterhead" means: - Hydrostatic head test: column of water that forces water through fabric - 10,000mm = 10-meter column of water before penetration - Industry standard for outdoor gear: 1,500-3,000mm is "rainproof" - 10,000mm = virtually waterproof for any realistic weather - Equivalent to surviving a full submersion under mild pressure Practical comparison: - Cheap nylon: 500-1,000mm (soaks through in heavy rain) - Standard rain jackets: 5,000-10,000mm - Heavy-duty tarp fabric: 5,000-15,000mm - Evac at 10,000mm = robust for bikepacking conditions Combined waterproofing system: - 10,000mm waterhead rating - Fully taped seams - Roll-top Hypalon closure - Air-permeable Evac laminate base (lets air escape, keeps water out) - = Multi-stage waterproof defense

The Evac laminate is the signature feature of the Evac product line — STS's air-permeable waterproof material: What it does (per STS): - Lets air OUT of the dry bag - Keeps water OUT - "Squeeze out air through the Evac base for a smaller, more stable packed load" Why this matters: - Conventional dry bags = sealed (air stays in) - Sealed bag with air = puffy, unstable on a bike - Puffy bag = affects bike handling, catches wind - Evac laminate = compress air out = compact + stable Use: - Close the roll-top - Squeeze the bag with your hands (or sit on it) - Air escapes through the Evac base - Bag stays compressed until you open it Applications beyond bikepacking: - Paddle sports (compresses after kayaking) - Mountaineering (compresses for tight packs) - Snow sports (less air = less thermal convection) - All outdoor uses that benefit from compact load

The dry bag uses a roll-top Hypalon closure — the gold standard for waterproof dry bags: How roll-top works: 1. Fold the top of the bag down 3-4 times 2. Each fold creates a mechanical seal 3. The compression keeps the rolls from unrolling 4. Hypalon (a synthetic rubber) maintains elasticity + water resistance Why this is the best closure: - Mechanical (no zippers to fail) - Reusable (roll and unroll repeatedly) - Self-sealing (compression creates the seal) - Hypalon is highly waterproof (better than typical nylon) Hypalon material: - Synthetic rubber developed by DuPont - Highly resistant to UV, water, chemicals - Flexible at low temperatures (won't stiffen in cold) - Used in premium dry bag closures - Replaces older PVC/TPU seals that degrade

The Evac Bikepack uses a 3-part mounting system specifically for bike cargo cages: 1. Stretch-Loc Straps: - Elastic wrap straps - Hook around cargo cage, fork, or frame tube - Integrated keeper buckle (STS-proprietary design) - Adjustable length - Fast on/off (no knots) 2. Triple Lash Rails: - Reinforced attachment points on the bag - Multiple lashing options for irregular loads - Daisy-chain style (pass cord through any rail) - Mount in different orientations 3. Hypalon Back Panel: - Grippy friction surface on the bike-contact side - Holds bag in place during bike movement - Reduced sway + rattle - Doesn't slip on frame/fork Mounting options: - Cargo cage (standard bike accessory) - Fork legs (most common bikepacking setup) - Downtube / top tube (frame-bag alternative) - Rear rack (less common but possible) Bikepacking setup: - One bag on fork (typically Right side) - One bag on frame (downtube + top tube combo) - Total cargo capacity: 7.4 L (2 × 3.7L) - Sufficient for multi-day bikepacking

Per STS: "Field-repairable buckles can be easily and permanently replaced for long-term reliability." Why field-repairable matters: - Standard buckles: snap in use, can't be replaced without sewing - Field-repairable buckles: removable pin design - Replace buckle without tools (sometimes) - Continue using the bag while ordering a replacement 15mm buckle size: - Universal size (most outdoor gear buckles are 15mm or 20mm) - Replacement buckles widely available - STS sells replacements Buckle failure modes: - Plastic weakens over time (UV + cold) - Cracking or breaking in cold weather - Pin slips out under shock load Field replacement: - Most field-repairable buckles: 2 parts, snap together - Replace with a standard 15mm buckle (Amazon, REI, etc.) - No tools required - Keep the old one for reference

The interior uses a white TPU laminate — uncommon but valuable: Why white interior: - Easier to see gear inside the bag - Find small items (flashlight, batteries, etc.) in low light - Reduces rummaging time when packing/unpacking - Better visibility in dim bike-light conditions Why TPU laminate: - TPU = Thermoplastic Polyurethane - Food-safe (won't off-gas harmful chemicals) - Flexible at low temps - Bonded to the outer nylon (no separate layers) - Same waterproofness as TPU coatings (10,000mm contribution) Practical: - Clean as needed (mild soap + water) - Won't delaminate (properly bonded) - Adds negligible weight

Fork Mount (most common): - One bag per fork leg - Cargo cage on fork legs - Stretch-Loc straps around cage - Hypalon grips fork legs Frame Mount: - Downtube + top tube combo (handlebar bag style) - One bag per mounting location - Or one bag on top tube, one on downtube Cargo Cage Mounting: - Standard bike accessory (front fork, rear rack, etc.) - Mount Evac directly to cage frame - Stretch-Loc provides extra security Handlebar Roll: - Optional (depends on handlebar bag setup) - Hypalon can roll against handlebar tape - Stretch-Loc as additional security Hybrid Setups: - One bag inside a larger handlebar roll - One bag on the seatpost as a "wedge bag" - Configurable to any bike Weight Distribution: - Front of bike: keeps steering stable - Rear: keeps back wheel grip - Low + centered: best bike handling - The Evac's compact shape = easy to balance placement

Bikepacking (PRIMARY): - Multi-day bikepacking trips - Frame + fork bag setup - Adventure cycling - Touring on rough roads Single-Day Gravel Rides: - Essentials + gear in compact bags - Frameset stability maintained - Weatherproof for unexpected rain Paddle Sports: - Packrafting (bike + boat combo) - Sea kayak support - SUP expeditions - Waterproof cargo on watercraft Mountaineering: - Approach bike + climb combos - Fast & light alpine pushes - Where you need waterproof + compressible Expedition Cycling: - Off-grid touring - International bike expeditions - Long-distance supported rides

Bike Cargo Cages: - Tubus cargo cage (rear rack compatible) - Old Man Mountain cage systems (front fork compatible) - Salsa Anything Cage (frame bag compatible) - Various aftermarket cargo cages fit standard mounts Bikepacking Frame Bags: - Apidura, Ortlieb, Rockgeist - Use alongside the Evac bags for total storage Handlebar Bags: - Pair with the Evac for front load (handlebar bag + frame bags + Evac fork bags) - Standard bikepacking setup Dry Bags (larger): - For non-bike cargo (e.g., larger gear) - STS has other dry bag lines (Big River, etc.) Spare 15mm Buckles: - Replacement field buckles - Carry spares for long tours Repair Tape: - Tenacious Tape or similar - Patch nylon or TPU tears Cargo Net / Bungee: - Stash items on top of the dry bag - Standard bikepacking accessory