MATEPROX Waterproof Dry Bag Roll Top 5L, 10L or 20L with Waterproof Phone Pouch (Floating Dry Sack)

What it is and why you’d want one

A waterproof dry bag is one of those “why didn’t I get this earlier?” bits of kit once you start doing water and outdoor days that don’t always go to plan. The MATEPROX Waterproof Dry Bag is a roll-top dry sack built to keep contents dry, and it comes in three sizes (5L, 10L and 20L) so you can match capacity to the trip.

The standout angle here is that it’s also described as floating, which matters if you’re on the water and want a little extra margin—think kayaks, rafting, or even beach-based days where gear ends up splashing, damp sand-wear and all. On top of that, the pack includes a waterproof phone pouch (the listing mentions a 10.1" pouch), which is handy if you’re the sort of person who wants to take your phone out without it becoming part of the “dry bag test”.

That said, it’s still a dry sack: it helps you manage water exposure, but it’s not a magic bubble for every scenario. If you regularly throw gear into full submersion or very long exposures, you’ll want to judge whether this style of sealing and roll-top closure is enough for your level of risk.

The essentials at a glance

This is a roll-top design, made from thick, hard-wearing, high-frequency, seamlessly welded material, with the promise of waterproof performance. The listing also points to a webbed shrinkage design for the 10L and 20L versions, designed to let the bag adjust more closely around what you pack each time.

In plain terms: it’s trying to give you a better seal and better fit rather than letting the bag flop around with wasted space when it’s only partly filled. If you’ve ever used a generic dry bag where the top takes forever to get neat, the “adjustable according to object size” idea is aimed at making the routine smoother.

A practical mini-scenario: you’re heading out on a short kayak session. You pack a change of clothes, roll the top tightly, and then tuck your phone into the waterproof phone pouch. The bag stays “dry enough” for what you need, while you can still use your phone without playing guessing games with condensation.

What you’ll notice in day-to-day use

Roll-top dry bags are great because they’re relatively straightforward—there’s no zipper to fight, and you’re relying on a consistent closure method. Over time, you learn the quick “tighten, press, and roll” rhythm. If you’re careful about rolling consistently, it tends to be one of the more reliable closure styles for keep-dry situations.

The phone pouch is another real-world touch: instead of stuffing a phone loose into the bag, you have a dedicated waterproof enclosure. That can reduce fiddling when you want to access your device quickly.

Where the bag may feel a bit less convincing is in the “floating” expectation. Floating can help in a loose sense, but how well something stays afloat can depend on what’s packed inside and how the bag is balanced. So if your plan is adventurous water where capsizes or long drift is a possibility, treat the floating mention as an extra benefit—not your only safety strategy.

Sizing: choosing between 5L, 10L and 20L

With three sizes on offer, the main buying decision is capacity.

• The 5L version suits smaller essentials: your phone pouch, a few small items, maybe a compact first-aid element.
• The 10L and 20L versions are more about proper dry storage for longer outdoor sessions or multiple items.

Because the listing also mentions a webbed shrinkage design specifically for the 10L/20L bags, those sizes may feel better if you tend to pack irregularly (not always perfectly full, not always the same kind of items). If you’re often packing bulky-ish gear but not maxing the bag, it’s worth keeping that “adjust according to the size of the object” concept in mind.

If you’re only carrying small valuables, the biggest size can be overkill. Bigger bags can be harder to roll neatly if you don’t fill them properly—even with the design tweaks—so don’t automatically jump up just because it feels safer.

Where it fits (and where it doesn’t)

This dry sack is positioned for a broad range of outdoor and water activities: beach, boating, kayaking, rafting, fishing, camping, hiking, snorkelling, and more. The listing also suggests it can be used as a supplemental emergency flotation device and as a bucket-like container for outdoor camping or fishing activities.

It’s a sensible pick if: It makes sense if you want one piece of kit that covers typical “keep it dry” use on the water or at the beach, and you like having a dedicated waterproof phone option rather than risking your device in the main bag.

It might not suit you if: You may want to skip it if you need deep, guaranteed protection under extreme submersion for long periods, or if your kit needs are very specialised (for example, you’re relying on it as a primary safety flotation system rather than a help.

Key things to check before buying

Before you commit, it’s worth double-checking a few practical details that matter more than marketing:

• Which size you actually need for your usual load. Roll-top bags tend to behave better when you’re not fighting an awkward fit.
• Whether the included waterproof phone pouch size (the listing references 10.1") matches the phone/tablet you plan to carry.
• How you’ll close the roll top. With any roll-top, your technique affects how effective it is.

Also, since the listing mentions waterproof phone pouch and waterproof dry sack in the same breath, it’s easy to assume everything inside is automatically fully protected at all times. In practice, you still need to pack carefully and seal thoroughly.

Is it worth it?

A solid pick if you’re buying your first roll-top dry sack (or upgrading) for kayaking, beach days, camping, or hiking where you want the contents protected from splashes and wet conditions, especially if you’ll benefit from the included waterproof phone pouch.

Better avoided if you’re expecting it to behave like a purpose-built safety flotation device in serious conditions, or if you’re mostly packing very small items and don’t want to manage the extra bulk of larger sizes.

If you’ve got occasional water outings and you want a straightforward, tough-looking dry bag with multiple capacity options, this one has a lot going for it. Just be honest about the limits: “waterproof” and “floating” are useful claims, but roll-top bags still come down to correct sealing and realistic expectations.

Mini FAQ

How do I keep items dry with a roll-top bag?

You’ll want to roll the top firmly and consistently, keeping the closure free of grit. A good seal is usually less about luck and more about how carefully you do the rolling every time.

Does it come in different capacities?

Yes. The listing states three sizes: 5L, 10L and 20L.

What’s the phone pouch for?

It’s described as waterproof and is included to help protect your phone so you can take it out during water sports without leaving it exposed.

Is it only for kayaking and rafting?

No. The listing also frames it for beach, camping, hiking, snorkelling and other outdoor activities—so it’s not just a water-only item.

Is it a safety flotation device?

The listing mentions it can be used as a supplemental emergency flotation device, but it’s best treated as extra help rather than a substitute for proper safety planning.