How to use the bags

Table of contents


  • 1: Rolling the bag
  • 2: Exercise
  • 3: The inner bags
  • 4: Cleaning the bags
  • Tips (updated)

1: Rolling the bag

Rolling the bag to make it look a specific way will take a tiny bit of practice. Don’t worry, you’ll get the hang of it quickly.

  • Always roll the backpack towards the back side.

The “front” of all bags is always the side with the logo on it, and for the Plett backpack, this is also the side with the front pocket.

The “back” of the bag is the side with the “line” running down the middle. For the backpack, this is also the side with the clips for the shoulder straps.

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  • We usually roll the top thrice (3X). This is considered the “standard” number of rolls for most dry bags. With this roll count the buckle will be facing the correct way, the backpack should be fully waterproof, a comfortable size, and it’s easy to clip the straps. 

You can easily adjust your number of folds to your desired size and waterproof level.

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  • Styling the look of the bag

Deciding how much air you leave in the bag, once the rolling starts, decides how the backpack will look. 

If you leave a lot of air in, when starting to roll, the bag will seem bulky. If you consciously press the air out before rolling up, you’ll have a baggier feel to it. Styling the bags accordingly is one of the only parts of using the bag that can take a bit of time to master.

Please keep in mind, if you want your bag to be waterproof, go after the bulky look, because if air can’t escape the bag, its a good indication that water also won’t be able to get in. If the bag is less tight at the top, and air is moving freely, water can easily enter the bag.

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  • Clipping

Attaching and detaching the adjustable shoulder strap clips is as easy and straightforward as you might expect. 

Simply clip the top ends of the shoulder straps to the designated clips at the top of the backpack . Clip the bottom ends of the shoulder straps to the designated clips attached to the bottom of the backside of the backpack.

  • Straps

Adjust the length of the shoulder straps to your liking.

2: Exercise

The Plett Backpack can act as a kettlebell, dumbbell and weighted vest. The Robberg inner bag can be used as a dumbbell, and has a weight guide inside to make measuring sand and water easier. There are endless possibilities for exercises that one can use to get in shape. 

An important note on the filling the Robberg & Plett Bags for workouts: we advise that you work out with them outside.

Here’s why: they’re waterproof on the outside. However, it’s easy to fill the bags with too much weight, and to seal them with some air inside them, or without enough rolls. This means that the bags themselves can slightly leak - and you may notice a small amount of liquid come out (nothing significant) during exercise. Another problem could be accidentally unbuckling the bags during exercise, resulting in the filled water or sand pouring out. 

Outside, this won’t impact your workout at all - and you won’t be much more wet/ sandy than when you filled up the bag in the first place. Inside, however, we want to make sure your electronics, carpets and wooden floors stay 100% dry, so avoid working out in places where water and sand don't belong!

We will be recording workouts with the bags, to give you practical suggestions on how the bags can be used best.

  • Step 1: Simply fill the bag with water, sand, or whatever you find in your environment. Roll up the bag to any size you want and start your workout.
  • Step 2: Work out. With the Plett backpack(s), and optionally with the modular bags, you will have endless opportunities for exercises, including kettlebell, dumbbell and weighted vest exercises.
  • Step 3: When you are finished with your workout simply empty the water/sand out of the bag, clip the shoulder straps back on, and you’re ready to go.
  • Weight maximums

Plett backpack: 12Kg / 26.5 lbs 

Robberg bag: 6Kg / 13.25 lbs

Please don’t fill the bags with more weight, as it can damage the bags, making them less waterproof.

  • Grips

Grips were created to make working out more comfortable.

  • Grips & holding the bags during exercise

The suggested position to hold the grip is illustrated on the photos below: 

  • Forearm is in a 90 degree angle to the bag when starting exercise
  • Notice how the fingers end up on the top side of the grip

Alternatively, for some exercises like kettlebell squats or swings, you might want to use two hands to hold the backpack. In these cases, feel free to hold the parts leading up to the buckle. You can even put two grips onto this area, if you need a wider grip.

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The only thing to avoid with your hand position is to have fingers pressing on the side of the grip. With a strong grip, your fingers might press too hard, accidentally releasing the buckle that is underneath the grip. If this is done during exercise, the water/sand might pour of the bag.

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3: The inner bags

The concept behind the Plett bag is to be used with modular bags. For this, we designed custom-fitting inner bags: Robberg and Bitou. Our idea here is that one bag is great: but what about your stuff that goes inside it? It makes complete sense to use the Plett bag as an overall adventure bag: but life gets messy and when using your bag as a weighted vest with sand gets sandy, we ended up wondering where our mobiles would go. Surely not sandy in the Plett bag?

We realised that for us to use this bag as we intended to, we needed inner bags. We spent a lot of time experimenting with inner bags that fit snugly into the Plett bag, as well as fitting in perfectly with the lifestyle that they support. We’ll go into details about how we have used the inners, and the reasons that they come in two different sizes.

Robberg: The sporty duo

The Robber bags come in pairs, and were designed to act as dumbbells: and built to comfortably hold 6kg each (when filled with sand). The inside of the Robberg bag has a weight guide printed on it, which will help you to adjust the weight you’d like to lift — according to set, exercise, or the type of workout you’d like to have that day.

Our favourite exercises that we’ve done with the Robberg duo have been lateral raises, Bent-Over-Rows, lunges, and squats.

An important note on the filling the Robberg & Plett Bags for workouts: we advise that you work out with them outside.

Here’s why: they’re waterproof on the outside. However, it’s easy to fill the bags with too much weight, and to seal them with some air inside them, or without enough rolls. This means that the bags themselves can slightly leak - and you may notice a small amount of liquid come out (nothing significant) during exercise. 

Outside, this won’t impact your workout at all - and you won’t be much more wet/ sandy than when you filled up the bag in the first place. Inside, however, we want to make sure your electronics, carpets and wooden floors stay 100% dry, so avoid working out in places where water and sand don't belong!

The other function of the Robberg bags is that they double as a storage unit for organising your gear. We sized the Robberg bags so that two of them can fit into the Plett backpack perfectly. This means that the width and height is adjusted to easily slide in and out of the Plett backpack. The bag’s dimensions, when full, are 20cm X 20cm // 7.85" X 7.85" — without the top buckle.

Bitou: the organised one

The Bitou bags come in threes. They were designed to fit into the Plett backpack stacked on top of one another. It’s great for organising the big bag into three compartments for a day trip or a longer hike. The bag’s dimensions, when full, are 13cm X 20cm // 5.18" X 7.85" — without the top buckle.

4: Cleaning the bags

Cleaning the bags is extremely easy. Simply use water to rinse off any dirt or sand off the bags. If you need the bags to dry quickly, use a towel to get the remaining drops of water off. After a long hike or workout on the beach, we just throw the bag into the water to get most of the dirt/sand off and then, if needed, we use the bathtub/shower at home to get the bags sparkling clean.

5: Tips 

(we’ll update this section every once in a while)

Below you’ll find some tips that we learned along the way, to make your experience that much better.

  • To keep your main bag clean, use the outer bag in combo with the inner bags and then fill those inner bags with water or sand. When the workout is over, you can empty the inner bag(s), and the main bag will remain completely dry/clean. You can simply fold the inner bags and put it into the main bag. They take up very little space and are pretty weightless.
  • There are several use cases for the (inner) bags outside of their intended purpose. For example, we’ve sometimes been using the Bitou bag as a “pool bag”, putting snacks into it and letting it float on the pool. We’ve also been putting our chalk bags into it after a climbing session, in order to not let the chalk go all over our bags. The Robberg bag is perfect to put dirty clothes or even shoes in it, after a workout. Get creative, explore more ways to use the bags.