Adventure Medical Kits Ultralight/Watertight .3 First Aid Kit Review

Overview

The Adventure Medical Kits Ultralight/Watertight .3 is the smallest kit in AMK’s well-regarded Ultralight/Watertight series — a stripped-down, pocket-sized first aid kit aimed squarely at solo day hikers, kayakers, and bikers who want waterproof protection without the bulk. At 74g (2.6 oz) and roughly the size of a deck of cards, it’s the kind of thing you toss into a hip belt pocket and forget about — until you need it. It won’t handle a serious backcountry emergency, but for the intended use case of a single-day outing for one person, it covers the common bases surprisingly well.

Key Specs

Spec	Detail
Weight	74 g (2.6 oz)
Packed Size	4.5” × 3.75” × 1”
Waterproofing	100% waterproof DryFlex bag
Intended Use	Solo day trips, 1 person
Comparison	See how the Ultralight/Watertight .3 compares to similar gear

Performance

Waterproofing

The DryFlex bag is the headline feature, and it earns the billing. The re-sealable DryFlex bag enables you to carry the kit in the outside pocket of a PFD where you can get to it quickly, and it remains watertight use after use. That resealable quality matters — a first aid kit you’ve already dipped into needs to stay dry too. Advanced 2-stage waterproofing keeps contents dry in rain, snow, and aquatic environments. In practice, this isn’t just marketing: multiple users across wet-weather activities have confirmed the bag keeps everything usable after exposure to the elements.

Contents & Coverage

The .3 contains the first aid essentials for solo day trips where portable, waterproof gear is a must — supplies to clean and bandage wounds, treat muscle aches, dress blisters, and treat other common outdoor injuries.

The full contents include: 5 fabric adhesive bandages (1” × 3”), 3 knuckle bandages, 2 butterfly closures, 3 sterile gauze dressings (2” × 2”), a conforming gauze bandage, 1/2” × 10-yard cloth tape, pre-cut moleskin, splinter/tick remover forceps, triple antibiotic ointment, antiseptic wipes, ibuprofen, diphenhydramine (antihistamine), itch relief wipes, and a safety pin.

Die-cut moleskin is the most reliable dressing to reduce friction and prevent blisters,

and having it pre-shaped saves time and the need for scissors in the field. Pre-cut moleskin means you don’t need scissors — a small but genuinely practical win.

Tick or splinter removal is handled by the included forceps, and itch relief wipes plus diphenhydramine cover minor allergic reactions to bites.

One REI reviewer put the kit to real use: “I’ve carried this in my pack for a couple of years. Last month, I had a weird fall hiking in Rocky Mountain National Park and scraped my elbow/forearm. Everything that I needed was in this little kit, alcohol wipe, 4x3 dressing, gauze, and tape. I used these supplies for a few days afterwards and the scrape was healing very nicely.” That’s a good field report for a kit this size.

The Gaps

Here’s where I have to be straight with you. Compared to the next step up — the .7 kit at 5.8 oz — the .3 makes some notable omissions. There are no latex-free gloves, no irrigation syringe for flushing wounds, no elastic bandage for sprains, and no duct tape. The cloth tape is also narrower at 1/2” vs. the 1” tape found in the .7. Being so small, it really only contains minor injury materials — but it does include a few items for more serious injuries such as butterfly closures for larger cuts.

The included tweezers — while functional for ticks and splinters — drew criticism in user reviews. The tweezers appear to be copied from Uncle Bill’s Silver Sliver Grippers and are not as precise. For tick removal specifically, a dedicated tick key is worth tossing into the bag. One reviewer noted their kit was missing some tweezers and pain killers, and recommended throwing in a few painkillers and a tick removing tool to boost usefulness — the waterproof bag is large enough to accommodate extras.

The medication quantities are also thin — a couple of ibuprofen and two diphenhydramine tablets won’t cover much. This is a kit for a one-day outing, not a pharmacy. Know that going in.

Size & Packability

The .3 fits neatly into just about every activity almost invisibly. Being incredibly compact — roughly 12×10cm by 2.5cm thick — it slides neatly into bikepacking framebag pockets or even hydration packs as a permanent fixture.

The ability to park it in a PFD chest pocket and not think about it is genuinely useful for paddle sports.

A Good Foundation

This doesn’t replace actual first aid training or knowledge, but it’s perfect to throw in a pack without taking up much space or adding weight. It’s a good foundation to build a larger kit from, if you need it.

That framing is accurate. Most experienced hikers will want to supplement it — personal prescription meds, a second pair of gloves, maybe some QuikClot — but as a starting scaffold, the .3 is well-curated for its weight class.

Pros & Cons

Pros

• Genuinely ultralight at 2.6 oz with a compact footprint that disappears into any pocket
• DryFlex bag holds up in rain, submersion, and repeated opening/closing
• Pre-cut moleskin is a thoughtful detail that saves time and tools
• Covers the most common day-hike injuries: cuts, scrapes, blisters, minor allergic reactions
• Enough internal volume to add a few personal items

Cons

• No latex-free gloves — a real omission for wound care
• No irrigation syringe for proper wound flushing
• Narrow 1/2” cloth tape; not ideal for larger dressings
• Forceps are functional but not precision instruments
• Medication quantities are minimal (expect 2 doses of ibuprofen, not 10)
• No duct tape, which the .7 and .9 kits include
• Not suitable for overnight trips or groups of two or more

Who Should Buy This

The .3 is the right call for ultralight-focused solo day hikers, mountain bikers, and paddlers who want a set-and-forget medical kit that covers scrapes, blisters, and minor cuts without noticeably adding to pack weight. It’s designed for multi-sport athletes — switch from hiking to kayaking to biking without changing your first aid kit — and was originally designed for adventure racing. If you’re heading out for more than a day, bringing a partner, or venturing into genuinely remote terrain, move up to the .7 (5.8 oz) or .9 in the same series. The jump in weight is real, but so is the jump in coverage.

Verdict

The AMK Ultralight/Watertight .3 does exactly what it claims: it’s a lightweight, waterproof kit for solo day trips, and it handles minor trail injuries competently. The omissions — no gloves, no irrigation syringe, bare-minimum tape — are predictable at this weight, but worth knowing before you rely on it. Treat it as a smart baseline, spend 10 minutes customizing it with a pair of nitrile gloves and a few extra ibuprofen, and it punches well above its weight class. 7/10.